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Correcting off-tempo tracks. Suppose you have both rhythm and melody tracks
recorded, but the melody was played erratically. First, copy the rhythm track to
the Windows clipboard. Then use groove quantize with a whole-note resolution, a
window of 25 percent or less, and with the Scale Time option selected. The Groove
Quantize command will synchronize the melody track with the groove source at
roughly measure boundaries, while maintaining the relative timing of the notes in
each measure.
Fixing a bad verse. Copy a good verse to the Clipboard. Then change the selected
range to cover only the bad verse. Perform a groove quantize using the Clipboard
contents as the groove source. The rhythms of the two verses then match.
Fit Improvisation
SONAR lets you record music from a MIDI controller without requiring that you
use a fixed tempo. In fact, if you record without using a metronome, you are very
likely to end up with a recording that does not fit onto a fixed tempo grid.
The Process-Fit Improvisation command lets you take a recording and create a
tempo map (with measure and beat boundaries) that fits what you played. Your
performance is not changed in any way, even though the note start times and
durations are adjusted to fit the new tempo map. This is important if you later
want to use any of SONAR’s editing features that depend on a proper tempo map
for best results.
To use this command, you must record a reference track containing a single clip
that matches your original track or tracks but has only a single note on each beat
boundary. You should make sure that the reference track has one event for every
single beat, with no extra beats or missing beats. The first beat of the reference
track should be at 1:01:000. You can use any editing command to adjust the
reference track.
If you want, you can use other types of events as markers on the reference track,
such as a sustain pedal. Remember, however, that MIDI sustain pedals generate
one event when the pedal is pressed and another when it is released. So if you
want to use the sustain pedal for the reference track, keep this in mind. Click
down, up, down, up, for one, two, three, four.
Remember that the better the quality of your reference track, the better job the Fit
Improvisation command can do. You want each of your reference track events to
be as close as possible to the beat of the music. Note that some keyboards transmit
aftertouch events when you record your reference track. These extra events will
prevent Process-Fit Improvisation from working properly. Therefore, you should
delete these events before using this command, or filter them out when recording
the reference track (using Options-Global-MIDI).
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