megadrum64?....

[scilence]

Is it possible to change the analogue board and use the 74hc4067's for 64 inputs? Would it require additional programming? can the atmega handle all the inputs?

[dmitri]

It can be done but 74hc4067 doesn't have an ESD and overvoltage tolerant alternative so you will have to use Schottky diodes on all inputs (64x2 = 128!). Also it doesn't seem to be as widely available as 4051.

[scilence]

would it take more programing on your part or do you think it would be kinda plug and play?

[dmitri]

It won't take much programming but will require small changes to the Digital board. Also, only Atmega644 will be able to handle this number of inputs due to RAM limits on Atmega32/324. To be honest, I don't see much demand for this for now.