Specifications

Chapter 5: Pro Tools Systems 49
Playback, Recording, and Voice Limits with Pro Tools HD
The table below lists the audio playback, recording, and voiceable track limits with Pro Tools HD software
with HDX, Pro Tools|HD, HD Native, Core Audio, and ASIO hardware (including Pro Tools with Com-
plete Production Toolkit). Playback and recording voices refers 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. Stereo and mul-
tichannel tracks take up one voice per channel.)
With HDX hardware accelerated and Pro Tools|HD systems, voice limits are dependent on the session
sample rate and the number of DSP chips dedicated to the system’s Playback Engine. Pro Tools HD can
open sessions with up to 768 audio tracks, but any audio tracks beyond that system’s voiceable track limit
will be automatically set to Voice Off.
s
Pro Tools HD audio playback, recording and voice limits by hardware configuration
Core System Type Maximum I/O
Sample
Rate (kHz)
Playback and
Recording
Voices
(Mono Tracks of
Simultaneous
Playback and
Recording)
Total
Voiceable
Tracks
HDX, 1 card 64 channels 44.1/48 256 768
88.2/96 128 768
176.4/192 64 768
HDX, 2 cards 128 channels 44.1/48 512 768
88.2/96 256 768
176.4/192 128 768
HDX, 3 cards 192 channels 44.1/48 1024 768
88.2/96 512 768
176.4/192 128 768