Log Message:
audio/fasttracker2: Updates to v1.19

Changes since v1.18:

v1.19 - 08.04.2020
- The "Trim" function had been 100% broken (and crashes the program) for a
  very long time. Sorry for this! This happened after instruments were
  changed to be allocated as needed.
- macOS: 48kHz is now the default audio output rate (instead of 44.1kHz)
- For x86_64/amd64 users: The audio channel mixer now has higher fractional
  precision on mixing deltas, which is beneficial for 96kHz audio frequency
  mode.