yes and no.
yes, i'll get this midi board off course.
but i'll start little by little.
i don't think it should be so complicated to solve any time issue. It's like leds blipping, but instead of one led, it's 24 leds, and all can be adjusted in intensity and individual lenght, more or less. But the essential resides in this :
sending current to led one, then sending current to led 2, then sending current to led 3 ( with a little variation of intensity, then etc, then start all over : send current to led one, etc ..
i think that adjusting the speed of this basic process is something programmable, and controlable with a knob in the end. then, it's all about the ear, that's all. no need to know that it goes at 53,000025 bps etc
the arduino will read with its sample rate the updates of values assigned to the different values that can be controled. that's all.
the difficult part although, to me, is how to make the arduino to record a serie of infos, to then work on it.