Steve Harris wrote: >On Fri, Oct 25, 2002 at 10:15:20 +0200, Tim Goetze wrote: >> >Nope, that would be hard ;) I was thinking of having a second, hard >> >clipping alg. and bringing that in for high ampltudes. >> >> oh yes, please keep on bringing them on. > >OK, I have some pending (easy) improvements to the meters, then I'l get >onto this.
:) >> i put in a music-dsp shaper (archive credits patrice tarrabia >> and bram) after the inverter, and with some eq (hp basically) >> before entering the first valve, it sounds surprisingly good. >> especially with the bridge pickup, the neck pickup is still a >> bit muddy. > >OK, time for a quick lesson - whats the difference between the pickups? My >bass (cheapish active 4 string) has two sets, a single wide one and a pair >slightly offset (they say duncan on them FWIW). There is a knob that, I >think crossfades between them. the neck, usually placed exactly where the second octave is on an over-sized fretboard, has far less dominant harmonics than the bridge. your bass probably is a fender 'precision' type. usually the split pickup is in the 'neck' position, though it is much closer to the bridge than on a guitar, because the sound becomes too dull if you pick up too little harmonics i guess. >> * it doesn't noticeably prolong sustain. >> * the attack phase is 'flat', compared to the ringing >> of the real thing. > >OK... could this be a property of the cliping? Or is it always there? always. i think it might be because a real valve amp sort of 'spreads the excess power' by turning the wave into almost square at this point, where the guitar signal carries a lot of energy. more of a limiter effect, right? >> * the sound gets muddy and faint when you turn down the >> volume at the instrument, instead of keeping loudness and >> reducing distortion. > >This is another compression effect I suspect. >I think that the compression effect in a guitar amp is much faster than >what you get from a general purpose compressor. I think it is more like a >slow acting saturation. My Valve rectifier plugin (valve_rect) was an my thoughts, too. >attempt to capture that, but I expect it needs adjusting, or rewriting. i just tried it before the first valve and it does help a good deal to have a better attack [in fact i got carried away strumming a funk pattern, a first time for playing the guitar through the box], but i'm slowly running out of cpu. i guess a real HP has to be added, too (the pre-eq is done in the mixer now) because the lower band still has too much shaping power over the sound (sort of an auto-wah effect, emphasizing the 'flat attack' problem). tim
