The ANALOG:GAIN parameter is an array of signed integer values – one entry per USED analog channel – that record the voltage ranges of the individual analog channels.  The implementers specified the following values:

0 = unknown

1 = +/- 10Volts

2 = +/- 5Volts

3 = +/- 2.5Volts

4 = +/- 1.25Volts.

This is a useful addition to the ANALOG parameters because is allows an application to record the gain or voltage range associated with individual analog channels.  This allows applications to modify the ANALOG:SCALE values to be adjusted when any particular channel gain is changed.  This is particularly useful since the gains applied to each analog channel are used in the calculations for the ANALOG:SCALE values associated with the channels – application software that can determine individual channel gains can modify the analog scale values safely.

This is compatible with the C3D file format although software applications may need to be modified to take advantage of the additional information.