User`s guide

Pro Tools Reference Guide6
TDM System Playback, Recording and Voice Limits
The following table lists the audio playback, recording, and voice limits of each type of
Pro Tools TDM system. The term virtual voice refers to the maximum number of audio
tracks that can share the available voices on your system. TDM-equipped Pro Tools systems
can open sessions with up to 128 audio tracks, but any audio tracks beyond that system’s
virtual voice limit will be automatically set to Voice Off.
All TDM-equipped Pro Tools systems provide a total of 32 internal mix busses. TDM sys-
tems also provide 5 Inserts and 5 Sends per track, up to the DSP capacity of your system.
Audio Interfaces for TDM Systems
The following table lists the input and output capabilities of the various Audio Interfaces
for TDM-equipped Pro Tools systems. In expanded TDM systems, Audio Interfaces can be
combined for up to 72 audio inputs and outputs.
Table 1. Pro Tools TDM System Audio Playback, Recording and Virtual Voice Limits
Core System Type
Voices
(Tracks of
Simultaneous
Playback)
Tracks of
Simultaneous
Recording
Virtual Voices
Pro Tools 24 MIX/MIXplus 32 or 64 32 or 64 86
Pro Tools 24 32 32 43
Pro Tools III (PCI) 16 16 53
Table 2. Pro Tools Audio Interface Channel Capabilities
Interface Type
Number of I/O
Channels
A/D
Conversion
D/A
Conversion
Digital I/O
888/24 I/O 8 in/8 out 24-bit 24-bit 24-bit
882/20 I/O 8 in/8 out 20-bit 20-bit 24-bit
888 I/O 8 in/8 out 18-bit 18-bit 24-bit
882 I/O 8 in/8 out 18-bit 18-bit 24-bit
1622 I/O 16 in/2 out 20-bit 20-bit 24-bit
ADAT Bridge I/O 16 in/16 out 20-bit 20-bit 24-bit