Logic Pro with HDX - Latency Issue

[JCollet]

Hey guys,

pardon me if there's some info on this, but I haven't managed to find it so far:

We're running PT with HDX and S6 in the main room. Logic Pro in another room. Some time ago we started to also run Logic in the main room and ran into two problems:
If using HDX as playback engine in PT everything works fine. Once we go with it in Logic, we get audible latency when monitoring during recording. Ok-ish for demo guitars or Vox, but as soon as you want to go for percussive things, it's too much. It's independent from buffer size etc. I know Logic cannot access the HDX DSPs, but is there any way to make this work? If we patch in the Mac Pro via Dante/DX32 and run Logic in Low Latency Mode it's way better. Using HDX is much more stable though and though preferred.


We run 6,1 Mac Pros with Mojave and latest versions of PT, Eucon/Drivers and Logic.

Thanks so much already,
best,
Julian

[unkJE]

Wondering if this could help:

Connecting DAWs Like Pro Tools and Logic Pro Together With Connector
https://youtu.be/br7te9hzcVs

"Blue Cat's Connector is an audio & MIDI streaming plug-in that can be used to transmit audio and MIDI signals in real time between several computers or applications, or create your own routings within a single application, with minimal latency"

Demo version available:
https://www.bluecataudio.com/Product...uct_Connector/

[LDS]

Unfortunately it is the downside of Avid Coreaudio drivers for HDX. Pro Tools doesn't use them, but third party DAWs and MacOS does. They have something like a minimum latency of ~17ms @ 44.1kHz... which is pretty awful.

Dante and DVS would be one work around. I tossed an RME HDSPe Madi card into my system to get around it, and just connected it to my DX32 as an additional monitor source.

Regarding Logic and the S6, I haven't used it in a few years but it was buggy as hell when I did. I suspect it probably falls at the feet of Apple to sort out.

[JCollet]

Thank you guys! So, having the latency in the core audio driver is a bummer for sure... I just read from somebody saying that it is changeable in Audio-Midi Setup, I'll try that later when I'm in the studio and will let you know if it worked.

Big ups to you for your help so far!

Cheers,
Julian

[uptheoctave]

It highly irritating and even the workarounds are cludgy.
Here is what I have tried.

1. Dante Virtual Soundcard. Fine to a point but high latency and when you change sample rate you have to piss about in Dante Controller AND Dadman AND Audio Midi.

2. Using another Dante audio card/interface. (Currently a Rednet PCIEr card) Better for latency but working in different sample rates is still irritating- still have to change sample rate in multiple places. it is great that all my inputs can have parity in PT and Logic/Nuendo etc, but that is more to do with Dante than Avid.

3. Keep the MTRX at a fixed sample rate and use a separate audio interface, running them in parallel. (Currently a UA Apollo X8). Works great for low latency and different samples rates IF your MTRX supports on the fly SR conversion (mine does, but that card is £2k). I also don't have the sort of input routing that I get in option 2.

I currently use option 2 and 3.
This means I have 3 audio interfaces connected to my Mac Pro.
I know, it is silly but there isn't another way around this problem currently, for me.

All of this would be unnecessary if Avid would write a core audio driver that had latency in the region of a USB audio card from 5 years ago.
But... no, that isn't apparently possible.

So my 2023 solution is to run HDX on one computer (2019 Mac Pro) and have a separate native rig (currently Red 16 Line, soon to be DAD AX64).

[LDS]

Originally Posted by uptheoctave

It highly irritating and even the workarounds are cludgy.
Here is what I have tried.

1. Dante Virtual Soundcard. Fine to a point but high latency and when you change sample rate you have to piss about in Dante Controller AND Dadman AND Audio Midi.

2. Using another Dante audio card/interface. (Currently a Rednet PCIEr card) Better for latency but working in different sample rates is still irritating- still have to change sample rate in multiple places. it is great that all my inputs can have parity in PT and Logic/Nuendo etc, but that is more to do with Dante than Avid.

3. Keep the MTRX at a fixed sample rate and use a separate audio interface, running them in parallel. (Currently a UA Apollo X8). Works great for low latency and different samples rates IF your MTRX supports on the fly SR conversion (mine does, but that card is £2k). I also don't have the sort of input routing that I get in option 2.

I currently use option 2 and 3.
This means I have 3 audio interfaces connected to my Mac Pro.
I know, it is silly but there isn't another way around this problem currently, for me.

All of this would be unnecessary if Avid would write a core audio driver that had latency in the region of a USB audio card from 5 years ago.
But... no, that isn't apparently possible.

So my 2023 solution is to run HDX on one computer (2019 Mac Pro) and have a separate native rig (currently Red 16 Line, soon to be DAD AX64).

On a random side note, did you ever find a solution to running your Trinnov at higher sample rates with the MTRX?

[JCollet]

Alright, so rumors were right. If you just go into Audio-Midi-Setup, right click on HDX then "configure device" (not "configure speakers"). Voila a Pro Tools lookalike window opens that lets you select the buffer size which is by default set to 256. So adding up with the one of Logic.
I set it to 32 and voila PROBLEM SOLVED!

Thanks for your ideas all! Really like the way with the additional MADI card into the DX32 aswell.

[JCollet]

EDIT: I deleted the S6 part and will post it into the right forum again, thanks!

[TNM]

Originally Posted by JCollet

Alright, so rumors were right. If you just go into Audio-Midi-Setup, right click on HDX then "configure device" (not "configure speakers"). Voila a Pro Tools lookalike window opens that lets you select the buffer size which is by default set to 256. So adding up with the one of Logic.
I set it to 32 and voila PROBLEM SOLVED!

Thanks for your ideas all! Really like the way with the additional MADI card into the DX32 aswell.

May I ask what the HDX core audio latency through Logic is at 32 buffer?

[JCollet]

I actually went measuring latency with both buffer settings set to 32 samples. This gave me 3.7ms roundtrip latency, measured, not calculated. Pretty much enough for 90% of what I do.
Stability is awful though. Working fine for hours on one day or not even for 10 seconds on most other days.