Vision and Studio Vision Pro Version 4.1 Manual ... - House of Synth

CHAPTER 11: Acadia: Optimizing for Digital Audio
Combine the MIDI track and audio
track into a single track and then view
its contents in the List Window.
Make sure Absolute SMPTE is
checked in the List Window menu.
After entering the Record Offset in the
Audio Preferences dialog, as determined
by the previous procedure, you are ready
to determine an optimum Play Offset for
your audio hardware:
Make note of the difference in SMPTE
bits between the MIDI events (hihat
note) and audio events (record offset
audio). In the above example, the distance
between the first two events is 55
bits. If this number varies throughout the
recorded measures, try to find an average
value.
NOTE: There are 80 bits to a single
SMPTE frame.
Use the following formula to calculate
an appropriate record offset value (in
samples). “N” is the number of
SMPTE bits arrived at in the previous
step.
record offset = 44100 * N / 2400
If we use 55 (bits) for N, your optimum
record offset would be around 1011
samples.
Route the output of your audio
hardware back into one of its inputs.
Record a copy of the “record offset”
file from the previous steps.
Assign this material to Audio-2 and
name the record file “play offset.”
As done previously, perform Strip
Silence on the newly recorded file.
Combine the newly recorded “play
offset” track with the previous track
containing the MIDI notes and “record
offset” audio events.
View the contents of the combined
track in the List Window.
Again, make sure Absolute SMPTE is
checked in the List Window menu.
Make note of the difference in SMPTE
bits between the audio events for
Audio-1 (record offset audio) and
Audio-2 (play offset audio). In the above
example, the distance between the first
two events is 30 bits. If this number
varies throughout the recorded measures,
try to find an average value.
(Remember, there are 80 bits to a
SMPTE frame.)
Vision & Studio Vision Pro — Version 4.1 Manual Supplement 91