Apple Impulse Response Utility - Manual (Page 14)

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 Mic Position menu: Selects the mic position label for the selected track. Both Impulse
Response Utility and Space Designer use these labels to identify, and process, the
audio files that comprise a multi-channel stereo or surround impulse response.
Impulse Response Utility automatically sets the mic position label for each track, but
you can change these labels to any other position (available in the current impulse
response format), if desired.
 Input menu: Sets the physical input for each track. Be sure to select the correct input
before recording.
 S[olo] button: Click to engage or disengage solo mode for the selected track. When
the Solo button is engaged (yellow), the input signal is routed to the monitor
section, and the input level is displayed in the VU Meter (see “
VU Meter ” below). Only
one track may be soloed at a time.
 R[ecord-Enable] button: Places the selected track into record-ready mode. The R
button turns red when engaged. Clicking this button also activates the Solo button
for the selected track, allowing you to monitor the input signal before recording. You
can record-enable several tracks at once, for multi-channel recording. When you click
Sweep/Record, a recording will be made on all record-enabled tracks.
 L[ock] button: Locks the Sweep Length and Reverb Time parameters, ensuring that
subsequent recordings use the same values.
 Peak: Displays the peak level value in dB. If the level ever exceeds 0 dB, the peak
value is held until cleared. Clicking on the Peak column header resets the Peak
readout for all tracks.
 Level: Displays input meters for each track. These level meters always show the
current level of the physical inputs.
Lock Mode and the Sweep Generator
As soon as one track is locked, the sweep generator parameters are also locked. This
ensures that any subsequent recordings will use identical sweep settings. This is
necessary, as every track must use an identical sine sweep—in order to produce a
phase coherent, accurate sounding, multi-channel impulse response.