DigiDesign Pro Tools 8.0 Reference Manual page 49

Pro Tools|HD System Playback, Recording and Voice Limits
The following table lists the audio playback, recording, and voiceable track limits of each type of
Pro Tools|HD 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 systems can open sessions with up to 256 audio tracks, but any audio tracks beyond that
system's voiceable track limit will be automatically set to Voice Off.
Table 5. Pro Tools|HD system audio playback, recording and voice limits
Core System Type
Pro Tools|HD 1
Pro Tools|HD Accel 2,
Pro Tools|HD Accel 3
Pro Tools|HD 2,
Pro Tools|HD 3,
or any expanded Pro Tools|HD system
Pro Tools|HD systems provide up to 160 Auxiliary Input tracks and a total of 128 internal mix busses.
These systems also provide up to 10 inserts and 10 sends per track (depending on the DSP capacity of
your system). Pro Tools|HD systems also support up to 128 Instrument tracks, 256 MIDI tracks,
128 VCA Master tracks, and multiple video tracks.
Playback
Sample Voices
Rate (Mono Tracks of
(kHz) Simultaneous
Playback)
44.1/48 96
88.2/96 48
176.4/192 18 (for PCIe)
12 (for PCI)
44.1/48 192
88.2/96 96
176.4/192 36
44.1/48 128
88.2/96 64
176.4/192 24
Recording
Voices Total
(Mono Tracks of Voiceable
Simultaneous Tracks
Recording)
96 112
48 48
18 (for PCIe) 18
12 (for PCI) (for PCIe)
12
(for PCI)
192 224
96 120
36 36
128 224
64 80
24 24
Chapter 4: Pro Tools Systems 31