I'm a bit hooked to TouchOSC nowadays, but now I want to take something that TouchOSC provides, i.e. Default Pull and use it in a script.

The script uses [else/multi.vsl] and it controls the amplitude of oscillators.
i'm using one message to set the amplitude of these 11 oscillators. they are set by throwing in a number:

0.5 0.125 0.083 0.062 0.05 0.042 0.036 0.031 0.028 0.025 0.023

but i wish for the numbers to go down, i.e. decay back to 0, in a lockstep fashion, i.e. if it is -0.001 per second, for instance, then each will be set to a lower and lower number until they all reach 0.

how do i accomplish this kind of "decay after 5 seconds or 10 seconds or 3 minutes" type thing, so that i can control, with a slider, how long it takes for the numbers to die off.
all of these numbers are sent out as a message to the multi.vsl object.

so, how do i take these numerous numbers, and then slowly ramp them down to 0?

if it helps, i'm trying to simulate tuning forks, or an acoustic instrument, well, not simulate, but the "release/decay" portion of it. i.e., "die after 5 seconds" or "die after 15 seconds".

@esaruoho Split the message using [unpack] and then use [line] to decay each output ... and then [pack] to put the list back together?
this.zip ... is not very elegant, but fairly simple.....
David.

@esaruoho said:

if it helps, i'm trying to simulate tuning forks, or an acoustic instrument, well, not simulate, but the "release/decay" portion of it. i.e., "die after 5 seconds" or "die after 15 seconds".

Sounds like a job for a decaying filter. I did this a while back.

0606-decay.pd

Edit: The patch says the energy doesn't have to be an impulse, but if it's longer than an impulse, energy will accumulate above 1.0 and then take longer to reach silence. So for enveloping purposes, the one-sample impulse makes the most sense as a trigger.

Edit 2: If you take two of these rpoles, one with a longer decay time and the other with a shorter time, and subtract longer - shorter, then you get a nice smooth attack-decay envelope (Decay2 in SuperCollider).

hjh

@whale-av said:

@esaruoho Split the message using [unpack] and then use [line] to decay each output ... and then [pack] to put the list back together?
this.zip ... is not very elegant, but fairly simple.....

thanks! i tried this, unfortunately what happens is that the multi_vsl object does not visually update in any way, which is strange. maybe the GUI is too busy to update, due to the flood generated. ouch. but thanks for providing something to try with! unfortunately also when i set the decay to 9500ms or more, the audio started dropping, which is weird. guess my setup is too complex to be fed data into with a fade like that, maybe it's because the subpatches have sliders updating themselves visually to maintain the hz etc. and the amplitude. that might be why the gui freezes from updating.

@esaruoho I might have made it too hungry...... updating every millisecond.
If you change the [line 0 1] inside [fade] to something like [line 0 250] it will output the list every 250ms which might be fast enough for your purpose, but stop dropouts.

But if you are adding the outputs of the oscillators together you could use just one [line] or [line~] to set the final summed level at 1 as [else/multi.vsl] sets their volumes, and then ramp down the summed level to zero in the required time...... which will be much more efficient.
David.

@whale-av said:

@esaruoho I might have made it too hungry...... updating every millisecond.
If you change the [line 0 1] inside [fade] to something like [line 0 250] it will output the list every 250ms which might be fast enough for your purpose, but stop dropouts.

But if you are adding the outputs of the oscillators together you could use just one [line] or [line~] to set the final summed level at 1 as [else/multi.vsl] sets their volumes, and then ramp down the summed level to zero in the required time...... which will be much more efficient.

thanks! i set it to 0 250 and it's awesome!
this is great. oh. i actually set it to 0 50 and it works like a charm.