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Latency doubles when H9 is used in Pre / Post routing mode.

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workingtitle
Joined: Apr 10 2015
Posts: 10

Latency doubles when H9 is used in Pre / Post routing mode.

workingtitle
March 06, 2017 - 08:28 am

Unfortunately, latency doubles in pre / post mode although only one algorithm is active.

Can this be fixed in a software update? I use an H9 in pre/post mode and a second in normal routing mode. Unfortunately, the total latency (when both are on) is becoming unpleasantly high.

nickrose's picture
Eventide Staff
nickrose
Joined: Jan 17 2008
Posts: 4675
nickrose
March 06, 2017 - 08:49 am

Unfortunately it's the hardware - any latency is in the analog conversion, and if the signal goes through the unit twice (as it does in pre/post) you will get double the latency.

Is there anything you can do with KILLDRY to help ?

 

 

 

mistercharlie's picture
mistercharlie
Joined: Mar 26 2017
Posts: 83
mistercharlie
April 17, 2017 - 05:10 pm

Just to be clear, the signal gets an AD/DA conversion twice in pre/post mode, even though I'm only using either the pre or the post routing? It doesn't just ignore the unused in/out?

workingtitle
Joined: Apr 10 2015
Posts: 10
workingtitle
April 18, 2017 - 08:52 am

mistercharlie wrote:

Just to be clear, the signal gets an AD/DA conversion twice in pre/post mode, even though I'm only using either the pre or the post routing? It doesn't just ignore the unused in/out?

I'm pretty sure the signal is converted twice. The latency is twice as high in the pre/post mode.

nickrose's picture
Eventide Staff
nickrose
Joined: Jan 17 2008
Posts: 4675
nickrose
April 18, 2017 - 10:28 am

To confirm - Pre/Post is a dsp feature added after the unit was designed - there is no special hardware to perform the routing.

As a result, both inputs have to go into the signal processor to be routed, meaning each one has to go through the A/D and D/A.

If the signal were to be ignored, it would not appear at the appropriate output.

 

 

alexone
Joined: Sep 24 2013
Posts: 26
alexone
April 18, 2017 - 11:32 am

Unfortunately, the design of the H9 has not be thought with true bypass in mind.

workingtitle
Joined: Apr 10 2015
Posts: 10
workingtitle
April 19, 2017 - 08:06 am

I have my H9 in now in the first and last loop of my Musicom Lab EFX LITE 62M. This solves the problem for me.

Is the True Bypass Relay in the H9 only capable of switching both inputs and outputs at the same time?

nickrose's picture
Eventide Staff
nickrose
Joined: Jan 17 2008
Posts: 4675
nickrose
April 19, 2017 - 11:43 am

workingtitle wrote:

Is the True Bypass Relay in the H9 only capable of switching both inputs and outputs at the same time?

It is - it bypasses the whole unit - that's what it is for.

Actually there are two bypass relays - one switches inputs and the other switches outputs - this is done so that one can precede the other and avoid clicks. This stuff is not simple.

 

 

 

Wallower
Joined: Apr 12 2017
Posts: 15
Wallower
April 26, 2017 - 10:18 am

Not holding my breath, but I'd gladly give you guys more money to mod my H9 with additional relays so that the signal only goes through one stage of A/D D/A conversion in Pre/Post mode.