Specifications

Chapter 2: Pro Tools System Configurations 7
TDM System Playback, Recording and Voice Limits
The following table lists the audio playback, recording, and voiceable track limits of each type of
Pro Tools TDM system. Playback and recording voices refer to the number of unique simultaneous
playback and record tracks on your system. Total voiceable tracks refers to the maximum number of
audio tracks that can share the available voices on your system. (Mono tracks take up one voice. Ste-
reo and multichannel tracks take up one voice per channel.) Voice limits are dependent on the ses-
sion sample rate and the number of DSP chips dedicated to the system’s Playback Engine. Pro Tools
HD-series systems can open sessions with up to 256 audio tracks (and Pro Tools|24 MIX-series can
open sessions with up to 128 audio tracks), but any audio tracks beyond that system’s voiceable track
limit will be automatically set to Voice Off.
Pro Tools|HD-series systems provide up to 128 Auxiliary tracks (Auxiliary Inputs); Pro Tools|24 MIX-
series systems provide up to 64 Auxiliary Inputs. All TDM-equipped Pro Tools systems also provide a
total of 64 internal mix busses, and up to 5 inserts and 5 sends per track (depending on the DSP ca-
pacity of your system). In addition, Pro Tools TDM systems support up to 256 MIDI tracks.
Table 3. Pro Tools TDM system audio playback, recording and voice limits
Core System Type
Sample
Rate
(kHz)
Voices (Mono Tracks of
Simultaneous
Playback)
Mono Tracks of
Simultaneous
Recording
Total
Voiceable
Tracks
Pro Tools|HD 1 44.1/48 96 96 112
88.2/96 48 48 48
176.4/192 12 12 12
Pro Tools|HD Accel 2,
Pro Tools|HD Accel 3
44.1/48 192 192 224
88.2/96 96 96 80
176.4/192 36 36 24
Expanded Pro Tools|HD 1,
Pro Tools|HD 2,
Pro Tools|HD 3
44.1/48 128 128 224
88.2/96 64 64 80
176.4/192 24 24 24
Pro Tools|24 MIX,
Expanded Pro Tools|24 MIX,
Pro Tools|24 MIXplus,
Pro Tools|24 MIX
3
44.1/48 64 64 86