changing only velocity

[Charles Shehadi]

Hello all:

Once you've sent a note to the synthesizer...

(midi-write-message (make-note-on 1 pitch velocity))

is there any way to change the velocity without creating a new note-on?

I'd like to have a note get progressively louder over a period of time.  I
tried sending alot of new note-on messages with larger values for velocity,
but I get an attack for each of the new notes, and it doesn't sound smooth.

Any help would be appreciated.

-Charlie

Also... is there any way to change the attack and decay settings for an
instrument in general midi?