Synthesis very slow

[cifkao]

On my machine, the audio synthesis takes considerably longer (2 min 22 s to generate a 15s sample from the test set) than running the model itself (9 s for 512 tokens). (Is it because the synthesis engine is written in Python?)

Is there any faster way to listen to the outputs? When I try listening to the MIDI file directly, it doesn't sound correct (most of the notes are not even audible).