D-Control transport section and keyboard appears inoperable when Transport = Machine with some devices.

Seen in Pro Tools HD 7.2, 7.3.1cs3 and 7.4.2cs2.

Engaged and shuttling some devices (in this case a projector), where Transport = Machine, it is sometimes not possible to initiate playback or shuttle the device from the D-Control transport section or keyboard (or any other USB attached keyboard). Only the trackball or a mouse will work.

Workaround:
There is a preference in 7.2, 7.3 and 7.4 that needs to be enabled in order for the D-Control transport and keyboard to control the device correctly when Transport = Machine.

Here's how: Setup > Preferences > Synchronization > Enable 'Stop at Shuttle Speed Zero'.

Note: This preference appears to be enabled by default in earlier versions of Pro Tools (we tested 7.1cs10).

This preference must be enabled to control the Kinoton FP30 E/Q projector.
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