[fluid-dev] FluidSynth crash with large SoundFont

Hello, I have made a 256 MB piano SoundFont based on Splendid Grand. However, it seems to crash FluidSynth if I play certain notes. Here's the download link: http://www.schristiancollins.com/temp/Acoustica%20Grand-normal%20v1.02.sf2.bz2 -~Chris

[fluid-dev] Velocity to Initial FC default setting

Greetings, fluid-dev group! I am new here, but I wanted to contribute in any way I can. Sorry, I'm not a programmer, but I am a long-time SoundFont designer and I have been exploring FluidSynth lately as part of my foray into Linux. I believe that FluidSynth is a project of much greater

Re: [fluid-dev] Velocity to Initial FC default setting

is unfortunately somewhat limited on that server too at the moment, but there is one mirror that has a bit more for the actual instrument files themselves. Cheers! Josh On Sun, 2008-01-20 at 13:03 -0600, S. Christian Collins wrote: Greetings, fluid-dev group! I am new here, but I wanted

Re: [fluid-dev] Velocity to Initial FC default setting

Ebrahim, I have not been able to reproduce the release distortion on my end (Electric Grand). I'm using Qsynth Rosegarden for playing the samples. What is your FluidSynth setup? -~Chris Ebrahim Mayat wrote: On Jan 20, 2008, at 2:03 PM, S. Christian Collins wrote: I have been able

[fluid-dev] Fluidsynth crash fixed

A programmer friend of mine (who wishes to remain anonymous) has modified the FluidSynth source code to fix the crash experienced when using the Grand Piano soundfont I uploaded. In the file fluid_defsfont.c, change this line (both instances): if

[fluid-dev] GeneralUser GS v1.43 RC1

NOTE: I am re-sending this e-mail from my Gmail account, because Hotmail was screwing up my links. I have updated GeneralUser GS to version 1.43 RC1. In this version, I have copied the drumsets to the melodic pool in bank 120. Usually, access to the drumsets

Re: [fluid-dev] Limited dynamic in fluidsynth

Senjin, I have created a custom version of FluidSynth that includes the following modifications: A) velocity-to-filter cutoff modification B) fixed some crashes related to modulators C) set default velocity-to-attenuation to 144 dB instead of 96 dB for increased velocity-to-attenuation

Re: [fluid-dev] Limited dynamic in fluidsynth

. One more question: is the filter (mentioned in point A) turned on by default? Is there any way to interact with its settings? Thanks for help! Senjin S. Christian Collins pisze: Senjin, I have created a custom version of FluidSynth that includes the following modifications

Re: [fluid-dev] [PATCH] Requested changes to FluidSynth

SoundFont editors should probably follow this anomaly as well. Cheers. Josh Green On Thu, 2008-07-17 at 02:28 -0500, S. Christian Collins wrote: Well, I have found a problem with the change I made to the velocity scale. While it improves the velocity responsiveness, as well as related

Re: [fluid-dev] invalid instrument/drum selection

I'm used to the following behavior when using MIDI on a Creative card: when I select an instrument not present, such as bank 8 program 20, the MIDI track will sound using bank 0 program 20 instead. This seems like a simple and logical way to deal with missing patches, and is what I've come to

[fluid-dev] Re: Bug report with test SoundFont

Whoops... I accidentally left the end off of my description of the voice-allocation bug. I have updated the file. FYI, here is what was added: - For the final MIDI example, I created a piano preset that uses two samples per key, one panned hard left, and the other hard right and

Re: [fluid-dev] Soundfonts and their licensing

Christian Collins be made available as part of the new release distribution. Configuring rosegarden with this 'studio file' makes rosegarden work seamlessly with fluidsynth/qsynth when used together with Chris' soundfont: 'GeneralUser_GS_FluidSynth_v1.43_RC1.sf2 '. It is also noteworthy to mention

Re: [fluid-dev] Soundfonts and their licensing

i Mañó wrote: S. Christian Collins escrigué: David, What do I need to do to make the GeneralUser GS license comply with Debian's Free Software Guidelines? I believe GeneralUser's only restrictions currently are to prevent people from selling the work (since it's available for free

Re: [fluid-dev] Introductions and interest in FluidSynth

Hi, My name is S. Christian Collins, but I go by my middle name (Chris). About Me: I am a pianist, composer and sound designer with a master's in piano performance. I currently live in Madison, WI in the USA, teaching piano and composition at a local arts school. I have been working

[fluid-dev] Sostenuto CC 66

I noticed that the Sostenuto pedal (CC 66) doesn't seem to be implemented in FluidSynth, unless I'm missing something. I think this feature should definitely be implemented at some point. Do you all agree? -~Chris ___ fluid-dev mailing list

Re: [fluid-dev] two questions

Tizo, Regarding transposing a channel, have you tried Qmidiroute? I have used Qmidiroute when performing live to send different areas of the keyboard to different channels, and you can transpose not only notes, but controllers as well. You can also do sound layering this way. And... I

Re: [fluid-dev] two questions

tizo wrote: I have also tried channel coarse tunning, but adjusting that an octave down or up, it makes the sound really awful (I don't know why, I am not a soundfont expert). This is because course tune only changes the pitch of the sample, but does not adjust the sample split points. The

Re: [fluid-dev] rendering to file cuts off last note

I always do a CC 64 set to 0 a measure or two after the final note--that way, not only does the final note get to ring out, but any reverb still lingering gets captured in the recording. -~Chris David Henningsson wrote: Peter Bartjens skrev: Your suggestion that the midi file might have

Re: [fluid-dev] Re: MIDI Standard Specs

SoundFont synths that I have used over the years (such as the EMU10K1 synths) seem to put the default reverb at 0. Personally, I think this is preferred. I think reverb (like chorus) is one of those settings that should be left at 0 unless the musician specifically wants to add it to a

Re: [fluid-dev] Role of glib

I am not a developer, so I might be wrong on this, but perhaps the best solution would be to move to glib, and if someone wants to use FluidSynth on a platform not supported by glib, they could use an older version (1.0.9). -~Chris j...@resonance.org wrote: I've been somewhat avoiding the

Re: [fluid-dev] Short note durations on percussion channel

(drum pads) which expect percussion instruments to be one shot and not respond to note-offs. We need to handle this somehow, if FluidSynth is going to faithfully playback these MIDI files. Josh Quoting S. Christian Collins s.chriscoll...@gmail.com: My 2 cents: I'm pretty sure the Creative

Re: [fluid-dev] Short note durations on percussion channel

with a duration of 0 plays a note with the attack set to 0 (and a long release) and nothing sounds. This should apply to all channels, not just percussion tracks. -~Chris David Henningsson wrote: S. Christian Collins skrev: Josh, Thanks for explaining the true nature of the problem--I

Re: [fluid-dev] MIDI mode

Josh, How does this affect the GS sound effects bank? -~Chris j...@resonance.org wrote: So I went ahead and added GM On/Off and GS Reset SYSEX handling. There are now 2 parameters synth.midi-mode=normal/gm/gs and synth.midi-mode-lock=no/yes. If midi-mode-lock is set to yes then SYSEX MIDI

Re: [fluid-dev] Short note durations on percussion channel

is concerned, which is what we should follow. Josh Quoting David Henningsson launchpad@epost.diwic.se: S. Christian Collins skrev: Josh, Thanks for explaining the true nature of the problem--I misunderstood. I would like to propose the following for the percussion track: * A note-off

Re: [fluid-dev] MIDI mode

j...@resonance.org wrote: On the other hand, we have people relying on sound effects not being looped endlessly (as pointed out by Christian). I think the answer to that, is to always honor note-offs for looped instruments. This will fail on many percussion sounds in a GM bank that have a

Re: [fluid-dev] MIDI mode

j...@resonance.org wrote: It still seems a bit weird to me to try and pick a minimum note duration, which will work well with most instruments, which could have different attack durations, etc. It may be that it works fine in practice though. I just don't like it. If you have a percussion

Re: [fluid-dev] MIDI mode

j...@resonance.org wrote: Any ideas how we should have this option be selected in regards to gm/gs mode being enabled? I think it makes sense to have the note-off delay as the default behavior regardless of GM/GS mode. My reasoning for this is: 1. Some MIDI files that don't indicate

Re: [fluid-dev] Fwd: Re: [LAU] Fluidsynth, soundfonts, jack, and latency

j...@resonance.org wrote: The voice stealing algorithm also needs improvement. I just updated ticket 27 http://fluidsynth.resonance.org/trac/ticket/27 with an improvement to the voice-stealing method. It's a very minor code change, and might be worth adding to the pile for 1.1.1. Obviously,

Re: [fluid-dev] Future Chorus and Reverb for fluidsynth

One feature that would be perhaps even better would be the ability to route reverb-level adjusted output to an external send. For example, I could have two instruments, the first with reverb=128, the second with reverb=64. FluidSynth could have an optional output that is mixed for an fx

Re: [fluid-dev] Fluidsynth's volume is too dynamic

Sebastian, If you want to resort to the old way of scaling attenuation/velocity/volume, change line 36 in fluid_conv.h from: #define FLUID_ATTEN_POWER_FACTOR (-200.0) to #define FLUID_ATTEN_POWER_FACTOR (-531.509) The new way of handling volume/velocity is correct. However, E-MU

Re: [fluid-dev] Fluidsynth's volume is too dynamic

(default_vel2att_mod, 960.0); Of course, 960.0 refers to 96 dB default velocity-to-attenuation. -~Chris S. Christian Collins wrote: Sebastian, If you want to resort to the old way of scaling attenuation/velocity/volume, change line 36 in fluid_conv.h from: #define FLUID_ATTEN_POWER_FACTOR (-200.0

Re: [fluid-dev] Fluidsynth's volume is too dynamic

I should have mentioned that I am referring to FluidSynth 1.0.9 in my code references. -~Chris ___ fluid-dev mailing list fluid-dev@nongnu.org http://lists.nongnu.org/mailman/listinfo/fluid-dev

Re: [fluid-dev] Fluidsynth's volume is too dynamic

That sounds like an even better idea :) -~Chris j...@resonance.org wrote: Quoting S. Christian Collins s.chriscoll...@gmail.com: As a further follow-up to this issue, I was wondering if the default velocity-to-attenuation scale (96 dB) could be user-adjustable. For those that like less

Re: [fluid-dev] Fluidsynth instrument attenuation

Preset/Instrument level attenuation attenuates 0.4 dB for every 1 dB that you specify (according to the values reported by Vienna Soundfont Studio 2.xx). The reason for this behavior is compatibility... this is how Creative/E-MU designed their synth engines, and the thousands of SoundFonts

Re: [fluid-dev] Fluidsynth instrument attenuation

Preset/Instrument level attenuation attenuates 0.4 dB for every 1 dB that you specify (according to the values reported by Vienna Soundfont Studio 2.xx). The reason for this behavior is compatibility... this is how Creative/E-MU designed their synth engines, and the thousands of SoundFonts

Re: [fluid-dev] Fluidsynth instrument attenuation

be most reliable. I'm still on version 1.0.6 which has worked for my system with Jorgan for 5 years, albeit with various 'artefacts' in evidence! Many thanks for your help! Cheers, Gerald. On 21/07/10 01:11, S. Christian Collins wrote: Preset/Instrument level attenuation attenuates 0.4 dB

Re: [fluid-dev] Re: Son of ticket #65

Well if a default behavior has to be honored, wouldn't supporting the GS standard of bank switching be preferable to the current implementation? From what I've read, instead of selecting a patch from bank 1, FluidSynth is selecting from the percussion banks instead. Isn't this what channel

Re: [fluid-dev] Re: Son of ticket #65

mailto:elimargr...@gmail.com *Empfänger:* S. Christian Collins mailto:s.chriscoll...@gmail.com *Zeit:* 2010-08-02, 04:00:28 *Betreff:* Re: [fluid-dev] Re: Son of ticket #65 Its been a while since the topic of MIDI bank selection was discussed, so I'm frustratingly in the dark again

[fluid-dev] 1.1.3 crashes QJackCtl

I compiled and installed 1.1.3 (using checkinstall to create DEB packages)--there didn't seem to be any errors, but when I run Fluidsynth, it causes QJackCtl to have a very long X-run and then eventually QJackCtl crashes. If I run QJackCtl and then start Fluidsynth from a terminal I get the

Re: [fluid-dev] 1.1.3 crashes QJackCtl

Thanks, Orcan! Compiling without portaudio support solved the problem. -~Chris On 10/17/2010 08:11 PM, Orcan Ogetbil wrote: On Sun, Oct 17, 2010 at 8:51 PM, S. Christian Collins wrote: I compiled and installed 1.1.3 (using checkinstall to create DEB packages)--there didn't seem to be any

Re: [fluid-dev] Fluidsynth reverb settings

On 03/20/2011 03:32 PM, Pedro Lopez-Cabanillas wrote: * @param roomsize Reverb room size value (0.0-1.2) Is this a typo? Shouldn't it be 0.0-1.0 instead? -~Chris ___ fluid-dev mailing list fluid-dev@nongnu.org

Re: [fluid-dev] Diwic's wedding march

Very nice composition! Now you've inspired me to check out jOrgan :) -~Chris On 07/22/2011 02:34 PM, David Henningsson wrote: [adding jOrgan-user to CC] On 2011-07-20 19:37, Sven Meier wrote: Hi David, As a side note, I composed the wedding march myself ... using jOrgan, FluidSynth that

Re: [fluid-dev] Fast renderer end of track

On 09/18/2011 05:14 AM, David Henningsson wrote: Fixing it on the FluidSynth side seems ugly to me: What if EOT occurs with a everlasting note on? What about time to let the reverb decay after playing? Perhaps I'm overlooking something obvious (not being a programmer), but how about this

Re: [fluid-dev] complexity of soundfont synthesis engine

Hi Michael, I have responded to your individual questions below: On 09/19/2011 04:20 PM, Michael Geis wrote: We were under the (probably naive) impression that all a sampler needs to do is loop over wave tables and apply envelopes. Seeing that the soundfont specification actually allows for

Re: [fluid-dev] Volume background and foreground

For routing channels or scaling velocity, I use QMidiRoute. You may find it helpful in your case. If you are using Ubuntu, it should be in the repository. -~Chris On 01/30/2012 06:40 PM, James Ong wrote: Sure, I have a AKAI LPK25 portable keyboard which is without the ability to switch to

Re: [fluid-dev] Proposal: FluidSynth tester program

I'd be willing to test: * SoundFont compatibility, particularly the proper rendering of SoundFont 2.1 modulators, etc., since I use these quite frequently in my own SoundFonts. I should be able to quickly tell if something gets broken in this department. * Voice-stealing logic.

Re: [fluid-dev] FluidSynth MIDI driver for DOSBox

I ran across your patch about a month ago when I was setting up some DOS games for the PC hooked up to my TV. I came away with the impression that the DOSBox developers don't exactly have a reputation of accepting patches. I ended up just using Qsynth rather than deal with patching and compiling

Re: [fluid-dev] FluidSynth 1.1.6-rc1 ready for testing!

When compiling FluidSynth, I get the following errors when it gets to *fluid_oss.c.o*: /home/chris/Personal/Resource/Source/fluidsynth-1.1.6/src/drivers/fluid_oss.c: In function 'new_fluid_oss_audio_driver':

Re: [fluid-dev] Proposal: FluidSynth tester program

I tried to find out the same thing (which library is being used by Qsynth). I noticed the following text among the messages in Qsynth (click the Messages button to see them): fluidsynth: warning: Instrument not found on channel 9 [bank=128 prog=9], substituted [bank=128 prog=0] I

Re: [fluid-dev] Proposal: FluidSynth tester program

/2012 04:51 PM, David Henningsson wrote: On 07/30/2012 07:41 PM, S. Christian Collins wrote: On 07/28/2012 11:59 PM, David Henningsson wrote: 4) Run sudo make install ...to install the new version. Once you have finished testing, run sudo make uninstall ...to revert to the version that comes

Re: [fluid-dev] FluidSynth 1.1.6-rc1 ready for testing!

This works. Thanks. -~Chris On 07/30/2012 05:01 PM, David Henningsson wrote: On 07/30/2012 06:01 PM, S. Christian Collins wrote: When compiling FluidSynth, I get the following errors when it gets to *fluid_oss.c.o*: /home/chris/Personal/Resource/Source/fluidsynth-1.1.6/src/drivers

Re: [fluid-dev] Proposal: FluidSynth tester program

Even on my Intel Core i7 (2.8 GHz quad-core) I am able to get Fluidsynth to cause xruns when playing really fast on a stereo piano sound that I have (voice polyphony at 256). As I am playing fast arpeggios with the pedal down, I can watch the jack dsp load (as reported by Cadence) go higher and

[fluid-dev] Windows SoundFont VSTi's

I've downloaded them all... every single SoundFont-compatible VSTi I could find, and not a single one of them comes anywhere close to the accurate SoundFont reproduction of FluidSynth. Apparently, nobody else bothers to support SoundFont 2.1 modulators. I want to give high praise to all of the

Re: [fluid-dev] Windows SoundFont VSTi's

On 10/31/2012 06:17 AM, Ebrahim Mayat wrote: Chris Have you tried Krzysztof Foltman's Calf LV2 plug-in which in addition to being a monophonic synthesizer and an organ simulator is also a SF2 player ? http://calf.sourceforge.net/index.html Unfortunately, since my workflow is now in Windows,

Re: [fluid-dev] Windows SoundFont VSTi's

On 10/31/2012 05:18 AM, Pedro Lopez-Cabanillas wrote: What do you think about CoolSoft's VirtualMIDISynth? http://coolsoft.altervista.org/en/virtualmidisynth The page mentions your GeneralUser soundfont, so I assume you already know about this program. Yes, I am familiar with

Re: [fluid-dev] problems with fluidsynth 1.1.6 on a raspberry pi

Try GeneralUser GS FluidSynth version from this site http://www.schristiancollins.com/generaluser.php. It is much smaller than FluidR3, so it should hopefully use less CPU. -~Chris On 11/17/2012 04:25 AM, Jan Newmarch wrote: Recently there was a thread about 1.1.5 on an RPi. I'm picking that up

Re: [fluid-dev] problems with fluidsynth 1.1.6 on a raspberry pi

On 11/20/2012 01:58 AM, Jan Newmarch wrote: I ran perf (from linux-tools Debian pkg) on the RPi for nightsin.kar using two soundfonts and got 32.07% fluid_rvoice_buffers_mix 26.89% fluid_rvoice_dsp_interpolate_4th_order 12.99% fluid_iir_filter_apply 11.00%

Re: [fluid-dev] Velocity to gain formula

Okay, I might get some of the terminology wrong here (being a SoundFont designer but not a developer), but as I understand it, the default velocity-to-attenuation curve is -96 dB (at 0 velocity) to 0 dB (at 127 velocity). This is not calculated linearly but on a concave curve (which is the most

Re: [fluid-dev] notoff - decay/release

Hi Frank, Try using a SoundFont editor to edit the instrument's volume envelope release values to get the effect you are looking for. You can do this using Swami http://www.swamiproject.org/ (Linux), Viena http://www.synthfont.com/Viena_news.html (Windows) or Polyphone http://polyphone.fr/

Re: [fluid-dev] Supported Wave/Flac format other than SF2

Garth, Why not just use LinuxSampler if you want to use SFZ? -~Chris On 02/05/2015 05:19 PM, Garth Hjelte wrote: At 01:21 PM 2/5/2015, you wrote: Sure, we could just transfer it in, but then again, the results would be slightly wrong. Just as an example, sfz seems to have a three band EQ

Re: [fluid-dev] Fluidsynth cc

On 06/18/2016 02:00 PM, Greg Fritts wrote: Just wondering what would be involved in implementation of breath control ( continuous controller # 2 ) in fluidsynth. Thanks, Greg As far as I know, the response to CC #2 would need to be programmed into the

Re: [fluid-dev] Continuous controllers

arget too. Can you offer any advice? Ben On 23/06/16 15:16, S. Christian Collins wrote: I already responded to your question to the group on this matter. Did you not see it? There is no default modulator in the SoundFont spec for CC #2 (breath controller), so support must be added to the

Re: [fluid-dev] Continuous controllers

arget too. Can you offer any advice? Ben On 23/06/16 15:16, S. Christian Collins wrote: I already responded to your question to the group on this matter. Did you not see it? There is no default modulator in the SoundFont spec for CC #2 (breath controller), so support must be added to the

Re: [fluid-dev] Continuous controllers

I already responded to your question to the group on this matter. Did you not see it? There is no default modulator in the SoundFont spec for CC #2 (breath controller), so support must be added to the SoundFont preset itself using a modulator (CC#2 to attenuation, 96 dB using concave negative

Re: [fluid-dev] Continuous controllers

I already responded to your question to the group on this matter. Did you not see it? There is no default modulator in the SoundFont spec for CC #2 (breath controller), so support must be added to the SoundFont preset itself using a modulator (CC#2 to attenuation, 96 dB using concave negative

Re: [fluid-dev] Continuous controllers

On 06/23/2016 01:38 AM, Ben Gonzales wrote: Thanks. Note: I get 2 duplicate messages from you. Is it me or you? It's me. Sorry about that... ___ fluid-dev mailing list fluid-dev@nongnu.org https://lists.nongnu.org/mailman/listinfo/fluid-dev

Re: [fluid-dev] Continuous controllers

On 06/23/2016 08:28 PM, Element Green wrote: There are a bunch of default modulators which cause SoundFont instruments to respond to some of the defined MIDI controllers as expected (volume control, pitch bender, etc). When attempting to modify one of these, you have to first define a

Re: [fluid-dev] Continuous controllers

Sounds like you need to also cancel the default velocity-to-attenuation modulator: * Source: Note-On Velocity * Source curve: concave negative unipolar * Destination: Attenuation (volume envelope) * Amount Source: 0 -~Chris On 06/24/2016 05:17 PM, Ben Gonzales wrote: Hi all. I

Re: [fluid-dev] Continuous controllers

On 06/24/2016 10:30 AM, Element Green wrote: Its been a while since I was looking at this. After reading over the spec, it sounds like you are correct. This seems contrary to some of the behavior I have observed in Swami in particular. So it may be that there are some implementation issues

Re: [fluid-dev] Turning off modulators

On 03/16/2016 01:36 AM, Srijan Deshpande wrote: Hello, I'm using fluidsynth with a korg microkey37 I want to turn off the expression control (CC 11) mod wheel on my keyboard. The mod wheel is usually mapped to CC1, not CC11. Or are you talking about a separate controller on your keyboard

[fluid-dev] Using SoundFonts in 2016

Dear FluidSynth developers and fellow SoundFont aficionados, I have recently completed a very thorough review of the current landscape of SoundFont-compatible software, including DAW plugins, virtual GM devices and SoundFont editors. You can read the results of this study in my blog post,

Re: [fluid-dev] Re : Using SoundFonts in 2016

On 03/08/2016 08:41 AM, CERESA Jean-Jacques ENAC/ENAC wrote: Many thanks for you chart tests. Just one question, how long it took to do this work ? Oh man, I've been working on this for weeks, haha. Although a lot of what I wrote is based on knowledge that I have accumulated over the past

Re: [fluid-dev] SoundFont exclusiveClass

On 09/10/2016 04:08 PM, Dan Eble wrote: Making this worse, Fluidsynth does not seem to ramp down the during the release portion of the volume envelope (see “releaseVolEnv” in the SoundFont spec). I am unsure what you are saying here. Could you please clarify? Thanks, -~Chris

Re: [fluid-dev] SoundFont exclusiveClass

On 09/11/2016 07:23 PM, Dan Eble wrote: On Sep 11, 2016, at 17:44 , S. Christian Collins <s.chriscoll...@gmail.com> wrote: On 09/10/2016 04:08 PM, Dan Eble wrote: Making this worse, Fluidsynth does not seem to ramp down the during the release portion of the volume envelop

Re: [fluid-dev] Override envelope release time?

I know that the Creative SoundFont synths allowed realtime manipulation of envelopes using NRPN values. I am guessing that FluidSynth doesn't support this, correct? More info on the Creative NRPNs here . On

Re: [fluid-dev] fluidsynth tremolo (modulation)

You can set up a modulator in the SoundFont to route a MIDI CC to the mod LFO volume, which will create a tremolo effect. However, as with the vibrato, this effect is aligned independently with the start of each note, which is not usually the effect you want for an organ, where a single

Re: [fluid-dev] repeating a note with the sustain pedal active cuts off the previous note

acle to rendering a proper live performance. > I will look after this issue. > jjc. > Message du 04/06/21 00:47 > De : "S. Christian Collins" > A : "FluidSynth Devel" > Copie à : > Objet : [fluid-dev] repeat

[fluid-dev] repeating a note with the sustain pedal active cuts off the previous note

Hi folks, I have noticed in recent FluidSynth versions that when I am playing any type of piano or keyboard sound, notes will sometimes drop out unexpectedly. After a bit of experimentation, I discovered what the problem is: when playing the same note more than once with the sustain pedal