Editing the waveform of a MIDI sound

Hi all,
I'm trying to edit one of the MIDI sounds, specifically, I want the sound to cutoff sooner rather than having it linger.
What is the best way to do this?
My initial thought is to convert the software instrument (MIDI) into a wave file, then edit that wave file by deleting the "lingering" portion of the sound so that it cuts off the way I want it to. Then I can just paste that sound into the (not sure what it's called exactly) window that has all the tracks. It'd be even better to be able to assign that small wave file to a key on my MIDI controller. I've done something like this on Garageband so I assume it's possible to do on Logic.
Any help on how to pull this off with something similar to what I described above? Or even better, is there a simple way to do this? Thanks!

Hi
What Instrument are you using to create the 'sound'?
Most of Logic's Software Instruments have an 'Envelope' section. This is where you can adjust the ADSR of the sound (Attack (lead in), Decay, Sustain (how long actual sound lasts for), Release (length of trail...).
Here are some ways:
You can use the Sustain & Release parameter in the plugin to adjust the length.
You can use Track Automation and volume to cut the sound out too. (View > Track Automation, draw nodes for Volume, drag lines to create a fade out).
You can use Hyper draw (Region based automation) to do this.
You can bounce the MIDI region to an audio file (Solo track, File > Bounce), import audio file and in Sample Editor use the fade out function. (This destructively edits the audio file).
You can bounce the region to audio and in the Arrange area use the fade tool to non-destructively add a fade to the end of a region. Then use the Automation Curve tool to add a curve shape to the fade out.
There are many ways to do this
JG

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