[sdiy] Software problem hardware solution? + US patents

[Dan Gendreau]

> Bryon/Lincon,
>
> > I'd be surprised of the JV can't be tweaked to respond the way you want,
> as
> > well.
>
> Most modern synths that are half decent will let you set a velocity and/or
> aftertouch curve so you can choose the response.
> Failing that, you could easily do something quick and east with
> an AVR, MIDI
> in, MIDI out and some kind of control for both scales (2 pots), something
> like the MEGA8 would be ideal (Hardware USART, 6 channel ADC, 16MIPs)...
>
> Paul
>

I would suggest an AVR as well, but dont you think the Mega8 would be a bit
overkill?

I think an AT90S2313 would fit the task better. Its cheaper, has the same
hardware UART and ADC and its only a 20pin DIP versus 40. You really dont
need a big 16MIPs uC to filter MIDI. I would be surprised if you needed even
1MIPs (~320 CPU cycles/MIDI byte).

I would embed it right in the keyboard. Cut the MIDI output signal just
before the MIDI output buffer (its usually 2 inverters from a 7404) and
route it to the AVR UART input. Then route the AVR UART output back the the
keyboard's MIDI output buffer again.

-Dan G.