I’ve installed version 3.1 with win 7, my opinion is that with the midi management and the possibility to interact with soft synth and hardware synth and also live_audio , it was taken a very big step forward, thanks to Sam and the whole team of sonic pi.
I 've noticed some things :
the “piano” synth does not sound from the speaker , perhaps if it was used as a synthesis engine supercollider 3.9 , do you need to recompile the plugin?
it is possible to play chords and arpeggios with midi ?
I’ve been able to reproduce this locally - it appears that the extra ugens in SuperCollider 3.9 don’t work with Windows 7. I’ll see if I can get this fixed. Until then, apologies.
my laptop has in dual boot windows 7 professional 64 bit , and win 10 home 64 bit .
Just now I have installed sonic pi 3.1 also on win 10 (this way I have the possibility to test sonic pi with both operating systems) , I confirm that even in win 10 the piano synth does not sound.