No sampling or resampling is allowed. The audio needs to come from the MIDI and you can't freeze/bounce even for consistency. You can however process the audio using FX plugins (delays, reverbs, eq etc.) while it's being outputted from the synth, but manipulation in terms of stretching, chopping up etc. is not allowed.
The only use case for allowing bouncing/freezing is freezing the entire tracks/channels to save CPU.