Emulating accordion bellow shake for Synth

[jjj]

I still haven't found a genuine bellow shake emulation for my Tyros. - I managed to get near it, yet when I look at the bellow shake wave, I noticed that it consists of gradual hill up and hill down shapes, whereas my recorded bellow shakes look like hacked sound samples. On an accordion bellow shake the air first gradually mounts, then stops and then reverts. Albeit that happens fairly fast each sample goes through these 3 stages.
Since I wouldn't know how to PIC program such a bellow shake volume pattern, I thought of building a little LDR box, in which a spring suspended LED or a small bulb moves across a two sided v-shaped slit.
After lots of trial & error I might be able to faithfully emulate the impressive volume changes of an accordion bellow shake. - It's quite a valuable addition to any Synth, because it adds emotional presence to the otherwise cold electronic sounds. Years ago, I used to play the accordion and now plan to build myself a light-weight 5 row-JANKO accordion with a keyboard made from PC keys switches.
I already converted a 120-button accordion bass (bass section only) to MIDI for it. It was a hell of work, for I had to combine and solder all its chords manually via some 200 signal diodes so, that each button activates only one soft contact. The buttons now work far lighter than the buttons of a normal accordion bass. - Here's a picture of the 120 button accordion bass conversion to MIDI:

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