This patch wires up the LFO to the synth unit, and makes it affect pitch
(control over amplitude is not there yet). It also adds LFO delay to the
base LFO implementation, and there are some other cleanups as well (for
example, not unpacking patch data every note).
LFO speeds, delays, and pitch modulation ranges have been calibrated
against the DX7, but testing hasn't been exhaustive.
This patch adds the low-level implementation of an LFO, with the DX7
waveforms, but doesn't yet contain the note wiring. It also adds a fast
lookup table based exp function, which is mostly used for envelopes.
There are also some build tweaks. It's possible some build files are
out of sync with the source, but at least the Android app seems to
build.
Raph Levien