Waiting 1 microsec before change_vol() results in ~50 millisec attack

Reid115

on init
    declare $new_id
end on

on note
    ignore_event($EVENT_ID)
    
    $new_id := play_note($EVENT_NOTE, $EVENT_VELOCITY, 0, 500000)
    change_vol($new_id, -100000, 0)
    change_vol($new_id, 0, 0)
    
    wait(600000)
    
    $new_id := play_note($EVENT_NOTE, $EVENT_VELOCITY, 0, 500000)
    change_vol($new_id, -100000, 0)
    wait(1)
    change_vol($new_id, 0, 0)
end on

Take a look at this script. When you press a key, two notes will fire. Both events will start at -100db, but will immediately raise to 0db. The only difference is that the second event waits a single microsecond before raising the volume. The thing is, there's no way you should be able to tell the difference; 1 millisecond would be hard to identify, let alone 1 microsecond. But what ends up happening is that the second event sounds like it has a smooth ~50 millisecond attack. Am I missing something?

If you test the script yourself, make sure you have no volume AHDSR.

medusa

That's because change_vol has a slew, a smoothing. If there is no wait at all, the first change_vol is overwritten before it's even applied.