UAD Powered Plug-Ins Manual v5.2 - Just Music

UAD Track Advance
Overview
The previous discussions on delay compensation (see “Latency & Delay Compensation”
on page 90) apply mainly when using only audio tracks. When
MIDI tracks are played simultaneously alongside audio tracks, a different (but
related) synchronization issue can arise.
Let’s say you have a MIDI track and an audio track with a UAD plug-in on the
audio track insert. In this scenario, the host application will automatically
compensate for latency and no use of the UAD DelayComp or UAD Track Advance
is required.
However, if the audio track is sent to a send/group/bus and that
send/group/bus has a UAD plug-in on it, the audio track will be delayed in
relation to the MIDI track because the host does not compensate for latency
automatically on groups/buses (unless full-path latency compensation is implemented
in the host). If the MIDI track was an audio track, you would use the
UAD DelayComp on it to compensate for the latency. But you can’t put a UAD
DelayComp on a MIDI track, so what to do?
Enter the UAD Track Advance plug-in (TrackAdv for short). It operates just like
the DelayComp plug-in, but backwards. Instead of delaying unprocessed
tracks, it shifts them forward. It does this by reporting to the host application
that a track has a UAD plug-in on it, so the host compensates for the latency.
However, the track audio is not actually processed by the UAD so the net result
is that the audio plays early.
Figure 23. The UAD Track Advance plug-in window
Note: The Track Advance plug-in only works in hosts that support partial
(track inserts only) automatic delay compensation.
When to use
TrackAdv
UAD TrackAdv should be used whenever MIDI tracks are played alongside
audio tracks that are assigned to a send/group/bus that is using UAD plugin(s).
Important: UAD TrackAdv should not be used in host applications that provide
full PDC throughout the entire signal path. TrackAdv or DelayComp is not
needed at all in such hosts. See “Host PDC Implementation” on page 90.
UAD Powered Plug-Ins Manual - 95 - Chapter 9: UAD Delay Compensation