Describe the bug

The note# is stored in higher 8bit of user_osc_param::pitch as uint8_t datatype.

In my recognition, when NTS-1 receive a pitch bend MIDI message, note# stored in higher 8bit of user_osc_param::pitch is decremented (for pitch down) or incremented (for pitch up) from actual MIDI note# by NTS-1 system software.

Upward pitch bend message is OK, but downward pitch bend seems like:

So, when playing MIDI note#0 and any downward pitchbend received, overflow occurs because of unsigned integer (same problem occurs when playing MIDI note#1 and pitchbend less than -4096 received).

If this occurs, the playing tone's pitch gets extremely high (seems overflowed value is treated as higher note# by NTS-1 system software).

This problem occurs in both of preset oscillators and user oscillators.
The developer has no way to get real MIDI note# or pitch bend value, it should be fixed in NTS-1 system software.

To Reproduce
Steps to reproduce the behavior:

1. Choose any oscillator in NTS-1
2. Send note#0 on midi message
3. Send negative (any value within -1 to -8192) pitch bend midi message
4. The tone frequency gets incorrect

Expected behavior
The tone should be played correct frequency

Screenshots
N/A

Environment
NTS-1