Hi @Frankje @pjd @JackANDJude,
great alternative BeatBox, this Mini Pops !
I built this little machine and found two really funny things:
It worked without the extra voltage drop bit. Huh? ...
I checked with my multimeter and it worked on 5.05 Volt.
How to explain........
The new pulse output for an additional sequencer on D1 did not work in the beginning, I added my oscilloscope and saw very small pulses. So I added a little delay in the ino program (2 msec for the gatePin) and voila, the sequencer started... Use 10 msec and you get a different sound)
As a consequence the maximum beats per second dropped, but you can't have everything...
See the result here, with a sequecer and a micro sequencer with in total 4 different sound combinations:
(4 out of a zillion possible sounds !)