I agree with @nlb that it is difficult to play romantic piano music on Sonic Pi, but it is possible to play a midi file in Sonic Pi using its internal synths with some success: it does miss some notes, as I show in my experimental midi Player Program. I tweaked this slightly so that it is compatible with the latest 3.3beta of Sonic Pi and here is a rendition of part of Debussy’s Arabesque, using both the piano and pluck synths. The midi file is sent from MidiplayerX on a mac direct to Sonic Pi. I also use TouchOSC to control synth settings, as per the article.
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