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Old 03-19-2023, 09:33 AM
Peter Sprague Peter Sprague is offline
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Default Is PT Reaching the Channel Limit?

Hi Folks, I came up with something yesterday that I’m hoping some of you might know the answer.

I’m running a PT HD Accel rig (1 core card, 2 DSP cards) PT V.10 with a bunch of inputs and outputs connected via (1) HD I/o, and (3) 192’s. The reason for so many channels is we’re doing livestreams with a 6 piece jazz group all playing at the same time live.

I know there is a channel limit for this setup, I’m just not sure what it is.

All inputs work until I reach the last 192 which has 16 inputs. Channels 1 and 2 work and then everything stops working from channels 3 through 16. When I say “stops working” what happens is I can see level at the interface but in PT no input level comes through.

With all of these interfaces I have 56 input channels. If you subtract 14 from that (the channels on the last 192 that aren’t working) you get 42 channels.

Is there a 42 input channel threshold for this rig?

To make sure nothing was wrong with the last 192 I connected it as the sole interface and everything worked as it should.

Many thanks folks and can’t wait to hear your thoughts….best, Peter
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Old 03-19-2023, 10:46 AM
Darryl Ramm Darryl Ramm is online now
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Default Re: Is PT Reaching the Channel Limit?

What sample rate are you operating at and how many total mono equivalent tracks? Are additional voices being used up for plugin processing? You also need to count outputs. Best to work this out yourself and see where you are vs. the system I/O limits and (what is more likely the issue) the voice limits. Pro Tools 10 reference guide has explanations of all this, including a table of voice limits.

This likely highlights some of the pain of old TDM gear, for what is likely no benefit here (no need for low latency monitoring if this is all a live recording) you could avoid these low voice limits with a Pro Tools native system (or just about any other DAW) with CoreAudio or ASIO interfaces and a modern well set up computer (just a laptop in many cases).
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Old 03-19-2023, 01:41 PM
BScout BScout is offline
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Default Re: Is PT Reaching the Channel Limit?

42 was never a limit (it would be a 16/32/64 etc limit if there was one working against you.) But as Darryl said, a lot depends on sample rate, etc.

One simple thing is just open up the system usage window in Pro Tools and see what is maxed out (voices, DSP, etc)
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