Re: [Audacity-devel] Pan Envelope Editing?
A free multi-track audio editor and recorder
Brought to you by:
aosiniao
From: Gary N. <por...@gm...> - 2013-04-07 17:03:40
|
Greetings, Audio mixers I use regularly (Mackie 1640i, 1620i, 1220i etc) are audio taper and that would be a familiar user experience. Mackie attempts to keep total level constant I think a preferences choice of stock Audacity or audio taper would be good. Gary Nelson por...@gm... On Apr 1, 2013, at 1:43 PM, Steve the Fiddle <ste...@gm...> wrote: > On 1 April 2013 21:13, Thales <tha...@ya...> wrote: >> >> I've been looking at some other examples, because without a good design >> you've got nothing. >> >> It is per track. You pan left/right per track. Mixcraft 6 has an example >> of that. Acoustica's Mixcraft 6, according to my reading, gets rave reviews >> for its easy to use interface. At 1 minute 43 seconds into this video a >> very short discussion on pan enveloping for Mixcraft 6 starts. >> >> http://www.youtube.com/watch?v=MAWRazVHM98&list=PLhcPlwjTWWMuV_hz8On5zBWHnDRzu2D16&index=3 >> >> I'm using their design as a reference. >> >> Now, the question I have is magnitude distribution. I think it would be like >> this. When the signal is all left channel, you have 100/0. When the signal >> is all right channel, you have 0/100. So, I presume, when the signal is in >> the middle it's at 50/50. At all times the over all magnitude of the sound >> from both speakers combined is at 100% just by simple wave mechanics, >> because waves are additive. > > There are several options. > > The current Pan control attenuates either the left or right channels > when the slider is off centre. Thus, at +50% the left channel is > attenuated by 6dB and when panned to -50% the right channel is > attenuated by 6 dB. At the centre position (0.0) neither channel is > attenuated and when panned 100% left or right, the other channel is > silenced. I've never been particularly keen on this way of panning, > but it does have the advantage that panning will never cause clipping. > > It is much more common on hardware for a pan from left to right to > result in a progressive increase in one channel (all the way from 0% > to 100%) and a progressive decrease in the other channel (from 100% to > 0 %). The "progressive change" is often non-linear. > > Where the change in amplification is linear, the effect of panning > from hard left to hard right at a constant rate produces a stereo > effect of a sound travelling from the listeners left, through their > head, to the right. > > Where the change in amplification is "square law" (so that if hard > left is defined as the left channel at 100% and the right channel at > 0%, then at centre pan the gain is sqrt 0.5) then the stereo effect is > like a sound following a semi-circular path from left to right. > > So do we want to have just one pan "taper", or provide user choice? > If we provide choice, is this to be a "Preference" setting? > If we provide only one pan taper, then which one? > > Steve > >> >> Volume control would then be essential for adjusting the magnitude. >> >> James Crook wrote: >> "Probably also best if you spend some time looking at the envelope code. >> You'll need for example to understand how envelopes are stored in the >> project file, as you will do something similar for panning. " >> >> Yes, I'll do that. >> >> I welcome any feedback on this! >> >> ...John >> > > ------------------------------------------------------------------------------ > Own the Future-Intel® Level Up Game Demo Contest 2013 > Rise to greatness in Intel's independent game demo contest. > Compete for recognition, cash, and the chance to get your game > on Steam. $5K grand prize plus 10 genre and skill prizes. > Submit your demo by 6/6/13. http://p.sf.net/sfu/intel_levelupd2d > _______________________________________________ > audacity-devel mailing list > aud...@li... > https://lists.sourceforge.net/lists/listinfo/audacity-devel |