Need advice for drums sequencer (Teensy 3.1+ audio board + 128knobs/leds +lcd screen)

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nicolas_soundforce

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Hi guys,

So this what I whish to do. A drum sequencer with 8 rows of 16 steps so 128 knobs and leds.
Basically something like this but with sound generation on board : https://www.youtube.com/watch?v=gCeh_7UIcXs

I thought of a led matrix with this : http://www.adafruit.com/product/1427. It's made especially for 16x8 matrix and quite cheap compare to max chips.

For the switches, i thought about using 2 4051 multiplexing in cascade 8 other multiplexers. Or using a button matrix with 128 diodes.... but not too keen on soldering 128 other through hole parts...

On top of that I'd like a 20x4 lcd screen to display menu and show the parameters that are currently changed.
Then all the steps selected in the matrix need to play sound via the audio library + audio board. up to 8 sounds at the same time. and that needs to happen without humanly-noticeable latency and on a very tight pulse of a clock (internal or external). I'll need also about 12 pots for parameters tuning (volume, attack, decay, tuning,...).

I've haven't did the total IO count yet but I am under the impression that with the audio board and switches/pots/leds I am already out of IOs.

What would be a clever set-up for such a project ? Is it worth is to get a Teensy LC to handle the screen+IOs and a Teensy3.1 for the audio and the sequencing ?

EDIT: oohh I see on the pinout that the audio adapter is using the I2C pins and plenty other usefull pins. Is it even possible to use all those feature within one project ??

I did already a lot of research but I am sure some forum users have very interesting points and some chips/circuits suggestions.

Thanks in advance!
Nicolas.
 
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