User's Manual

Apollo Solo USB Manual Working With Apollo Solo USB 55
UAD Processing in DAW (Buffered)
When UAD plug-ins are used within compatible VST or AAX 64 host DAW applications
(i.e., outside of Console), monitored input signals are subject to I/O buffering latency
because the data must be shuttled back and forth between the DAW and the audio
interface.
The amount of input latency depends on the I/O buffer size setting (including when plug-
ins are not used, UAD or otherwise). As the buffer size is increased, more input latency
is induced. At lower buffer sizes, input latency is reduced but the host computer’s
CPU loads increase. With larger buffer sizes, input buffering latency makes software
monitoring via the DAW mixer while recording live inputs less practical — if the sound is
heard noticeably later than it is produced, it can compromise the performance.
Note that latency is not an issue during mixdown in a DAW because the performances are
already captured. The benefits of using Apollo Solo USB’s integrated DSP acceleration
when mixing with UAD plug-ins in the DAW include the off-loading of plug-in processing
from the host computer’s CPU, and the sonic rewards of UAD plug-ins.
DAW Processing Notes
• UAD plug-ins within a DAW are heard only when Apollo Solo USB and/or UAD-2
DSP accelerators are active in the system. UAD plug-ins can be loaded in a DAW
when UAD DSP is unavailable, but they will not process audio.
• When monitoring or recording Apollo Solo USB’s inputs in a DAW, eliminate I/O
buffering latency by using Console for hardware input monitoring and Realtime
UAD Processing.
UAD Processing in both Console and DAW
UAD plug-ins can be used within Console and a DAW at the same time. In this scenario,
Apollo Solo USB’s UAD DSP resources are shared between the two host applications.
Realtime UAD Processing is available via Console, and I/O buffered (non-realtime) UAD
processing is available via VST or AAX 64 plug-ins in the DAW.
Note: UAD plug-ins within a DAW can also run at the same time as native (host
CPU based) plug-ins, in any combination.
Bypass UAD plug-ins within DAW when monitoring with Console
To maximize available DSP resources for UAD plug-in processing within Console when
monitoring, power off or unload UAD plug-ins in the DAW.
Bypass Console plug-ins when mixing in DAW
To maximize available DSP resources for UAD plug-in processing within the DAW when
mixing, power off or unload the UAD plug-ins in Console.
Tip: Use the “Disable All” feature within Console (see Channel Options) to quickly
disable/enable all UAD plug-ins within Console.