As ZynAddSubFX still uses the horrible approach of storing global
settings (such as the currently used samplerate) in global static
variables the Echo effect will crash when the samplerate is changed
for a previously loaded ZynAddSubFX instance.
As a quick fix the original samplerate used for instantiating and
accessing internal arrays (whose size depends on global samplerate
variable) is saved for each instance and used everywhere instead of
SAMPLE_RATE.
Fixes crash when exporting e.g. Saber-FinalStep.mmpz at a higher
samplerate than LMMS normally runs with.
c6051e76b4