Tascam SX-1 Reference Manual page 141

When enabled, notes are moved so that
Releases
their end times align with the quantize grid.
When enabled, the duration of
Adjust Durations
the notes change to conform to the attack or release
quantize settings. If both attacks and releases are
Check this box to have the
Record Quantize
quantize settings applied to all incoming MIDI notes.
Part VII–MIDI Sequencing
being quantized, the notes will be stretched or shrunk
to fit into the nearest quantize grid.
This results in a recorded performance that is already
quantized.
TASCAM SX-1 Reference Manual
141