Stereo sample pairs should both use pitch generators from the right channel

[derselbst]

Looking over the noteon method in fluid_defsfont.c I don't see any code handling stereo pairs. The SoundFont specification 2.04 section 7.10 says that stereo pairs should use the pitch generators from the right channel for both samples. This means that any SoundFont with non-identical pitch generators for stereo pairs will not synthesize correctly, leading to detuning/drift between the 2 channels.

Reported by: elementgreen

Original Ticket: fluidsynth/tickets/61

[derselbst]

A small demo SF2 + MIDI would help understanding this one.