John is absolutely correct about velocity. If you are using the included GM set for your sounds increasing the velocity will only affect the volume of the note. That is because it only has one sound layer so the sound will not change with increased velocity, it will only get louder.

BUT if you are using a more advanced sound source it may, probably will, have many more sound layers. So now if you increase velocity you will also be altering the sound. A sound layer is dedicated to a velocity range so a low velocity will trigger a sound while other velocities will trigger of sounds. The instrument will stay the same but the tonal qualities will be different, i.e. like a softly played trumpet to one that is played very loud.

I hope this helps and good luck.

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