Super retour, j'aime ça 
- The font stuff could be improved, I will look at this. The screen seem to be the same size as psp, so the two can benefit from a lift.
- for the "mac" menu which is too fast, it is linked to the speed of the cpu and the refresh rate which is fast. So to fix it, you have to change the value of KEY_REPEAT_INTERVAL_LONG in Master.h define by platform. You can have a look at PatternPlayer.cpp and seek void handle_key_mac() which handle this.
it is small function to read and you will understand how it works.
- I will pull your commit
- for the midi sync, you need a usb otg cable and a midi gears or pc. In slave sync, Picoloop receive midi clock. In Master mode, picoloop send midi clock. You can also use a gameboy with arduinoboy to be the master in the midi chain. Picoloop can be the main sequencer or slave. And if I'm right it should works right on pocketchip. But today, only midi sync in out is implemented. No recording of midi note or midi cc. One day I will work on a full midi implementation, but today, midi sync is enough for me.
- for the loadavg of cpu, if top show 1%, then maybe it will be able to handle more beefy synthengine like cursynth, this last one run on raspberry 2, so maybe it will run smoothly on chip.
- for the screen size, there is two different thing for me. The desktop version should one day be able to be resize, but today it is not possible. The "handled" version should be fixed to fullscreen. And in this case, for me it is two different platform : the handled and the desktop version.
- Great this post on the pocketchip forum.
- I think I know why you don't have sound on the opl2 engine. There is two AR/DS screen in the A/R menu then a "T Amp" which is on Y the gate time and in X the amplification of the channel. you have to raise the gate time. put all in middle to keep simple and the sound will flow.
Then you can change from AM to FM in the " VCO" menu.
Great work see you soon