On Thu, 2006-04-20 at 09:36 +0200, Comix wrote: > On 4/16/06, Scott Bahling <[EMAIL PROTECTED]> wrote: > > Hi, > > > > With latest 0.9.4 svn, I was wondering why my audio output was so low. > > It is because of the new pan editor and related note left and right > > values. The current implementation limits the note's left and right > > values to 0.5. The sampler scales the overall output by these values > > which means that the output level is now cut in half. > > > > When centered, the left and right values should be 1.0. Actually this is > > more like a "balance" than a "pan" control since we are just adjusting > > the levels of the left and right signals rather than mixing a signal > > between stereo outputs. > > > > thanks, I'll look into this. > Can you explain me better the difference between balance and pan?
The idea of pan is to position a signal in a stereo image maintaining the apparent loudness as you do so. Balance is adjusting the level of the left and right output. When I think of pan, I think of mixing a mono signal into a stereo image. Normally you deal with mono "tracks" in a recording setup. These tracks are routed through the mixer and mixed to a 2 channel output (or 5.1 etc...). Even when I have a "stereo" signal (like stereo mic setup, or return from effects unit) I normally route each signal through its own mono channel on the mixer. The difference is that you are actually sending a certain percent of the signal to either stereo output. When working with a stereo signal, you either need to have 2 pan controls for mixing each channel to the output of choice, or you have one control that just adjusts the level (balance) - but in this case the right channel never "moves" to the left or left to right. I suppose adjusting a mono signal split into a stereo with balance has a similar effect of pan, but there is the issue of loudness. Pan controls normally have a taper so that when panning the signal hard left or right, the level is at say unity. When mixing between two outputs, the signal levels to each output are less than unity in order to maintain a consistent loudness with the combined outputs. I once played with modifying pan in hydrogen to be a real pan using the tangent law, and had it working. Then I realized that I was thinking to much like a mixer, and hydrogen is really an instrument or synth, so it can have true stereo sources and then you need to treat pan differently, and it gets complicated etc... I just route my H2 outputs to Ardour and pan and mix from there so it is not a big issue for me. Here is an paper on panning algorithms - http://www.acoustics.hut.fi/research/cat/vbap/papers/pulkkiaes22.pdf I think most software mixers use some variant of the tangent law. -Scott ------------------------------------------------------- Using Tomcat but need to do more? Need to support web services, security? Get stuff done quickly with pre-integrated technology to make your job easier Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642 _______________________________________________ Hydrogen-devel mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/hydrogen-devel
