[RWP] Midi Sync for Compensating Hardware Latency

[Jim Snowbarger]

Indigo, I can't find these settings.
Are you talking about the track recording settings that you get when 
pressing the context key on a track?
It sounds like those settings affect how midi plays bac when playing the 
project.
I really don't like the idea of messing with audio buffering settings to 
deal with a simple midi delay.  Those things are more dependent on hard disk 
speed, and other things that actually affect audio performance.  I really 
don't see why those settings should affect midi through.
Yes, it does have a midi through.  it is what happens when you set up a 
track to record midi input, arm it for recording, and turn monitoring on. 
The midi data gets echoed out the midi output.  Eventually.
In fact, that is the way I would want to use it.  My sound module would be 
tracking my keyboard action when I 'm recording through the monitoring. 
Then, when you punch out, it will automatically receive the playback.
I think I got the throughput delay to diminish a little by by unchecking the 
item that restricts midi hardware to a single thread.  Frankly, I'm slowly 
coming to the conclusion that this is just a reaper bug.
It's a pretty nasty bug, for my mode of operation.



----- Original Message ----- 
From: "Indigo" <33indigo at charter.net>
To: "Reapers Without Peepers" <rwp at reaaccess.com>
Sent: Friday, August 19, 2011 6:37 AM
Subject: Re: [RWP] Midi Sync for Compensating Hardware Latency


> There are midi input and output offset settings just at the end of record 
> settings, but I don't know if these are the sync settings referred to.
> Still looking. for something specifically called sync offset.
>
> On 8/19/2011 5:31 AM, Indigo wrote:
>> I think this forum post might have exactly what's needed for your
>> hardware latency problem.
>>
>> Quote:
>> Reaper midi sync latency compensation setting
>>
>> Question: I recently scored a tr-727 so I synced it up to my TC konnekt
>> 8, which I ran
>> "midiTest" on, (if you don't know what it is google it... pretty
>> interesting!) and
>> it says my midi 'send' time is less than a millisecond.
>> I then routed the output of the 727 into a channel running 44.1 with 2.6
>> ms latency.
>> When I try to sync the output of the 727 to the click in reaper it is
>> off by a considerable
>> amount ... I was wondering where the setting is to compensate for the
>> latency? My
>> immediate fix was to nudge everything else in the project over to sync
>> with it, but I know there must be a better way.
>> otherwise it syncs rock solid as long as I start from the very beginning
>> of the track!
>> Answer: There's 'MIDI output offset' for every single MIDI output. A
>> positive value delays
>> the MIDI stream by X milliseconds, whereas a negative value makes the
>> MIDI to play
>> X milliseconds ahead.
>> I believe a negative value is the most usable, external gear usually has
>> some latency
>> which you want to compensate for - the MIDI stream needs to play a
>> little bit ahead
>> of main audio output to actually play in sync with it.
>> However, there's a limitation in 'MIDI output offset'. A negative offset
>> of about
>> 20 milliseconds seems to be the maximum negative offset.
>> If more than 20 ms negative offset is needed, it's possible to use
>> ReaInsert and
>> it's plugin delay compensation. This is what I do. It's possible to have
>> a negative
>> offset of several seconds.
>>
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