Ripple effect sound when releasing sustain pedal

Please rename the file extension from mp3 to ogg. Should work .  if it's a known issue I'll try reducing the max poly and see what happens. By the way, a separate question. There is a button on the alesis q88 keyboard called advance. How could this be programmed for use as a toggle for the voices so piano on 0, harp on 1 etc?

Worked indeed 
Also proved you were using continuously pressed sustain obtaining an effect that can be achieved without running into CPU constraints and (imho) with a nicer and adaptable effect character via reverb - just try & experiment with the parameters.

As for the q88 operation: just read the q88 manual as it has standard program change as supported by samplerbox:

Code:

Incremental/Decremental Program Change:
1. Press the Advanced button.
2. Press the black key labeled "PROGRAM" (F#2).
3. Now the Octave “+” and “-” keys can be used to change the program.
4. Press “+” and continue to play notes until you find the instrument you want.

Other midi controls are available as well if I understood correctly after my quick glance - but I'm not an Alesis support engineer 
Anyway: have fun !