[RWP] Sorry, Correction: Midi Sync for Compensating Hardware Latency

Sun Aug 21 21:54:28 EDT 2011

Very interesting.  when I open the configure input dialog, I see different 
items than you do.
There is no edit box for latency offsets at all.
That must be different for diferent midi input devices.

Indigo, in your previous message, when you were talking about your own setup 
driving the drum machine, not  showing any latency, you have recording 
armed.  When you unarm the track, does that then prevent your midi keyboard 
from controlling your drum machine?  If it does, then you are doing the same 
exact thing I'm doing, and I'm jealous.   When I get over my current lazy 
streak, I'm going to move this midi set up over to my windows 7 64 screamer, 
and see if there is any difference.

----- Original Message ----- 
From: "Indigo" <33indigo at charter.net>
To: "Reapers Without Peepers" <rwp at reaaccess.com>
Sent: Sunday, August 21, 2011 10:13 AM
Subject: [RWP] Sorry, Correction: Midi Sync for Compensating Hardware 
Latency

> Sorry, I was mistaken about the purpose of the offset settings in 
> Options/preferences/recording.
> Those settings are not for latency offset for a selected midi device, as 
> some Cockos forums suggested, but apparently  for recording input and 
> output latency.
>
> The latency offset settings for specific midi devices are in 
> Options/Preferences Midi Devices.
> To set the latency offset for a midi output device,
> go to Midi Devices, tab to Midi Output Device to Make Available..., select 
> the desired device with the arrow keys.
> Then go to the number pad and find the name of the selected midi device.
> Right click on that name at the number pad.
> A context menu opens.
> Go back to your arrow keys and arrow to the selection: Configure Output C.
> With each press of the tab key, you get:
> 1. device name,
> 2. enable output for this device, with a checkbox, which should be 
> checked,
> 3. send clock for this device, with a checkbox to check only when you need 
> clock output,
> 4. open device in low latency low precision mode, remember that checking 
> this gives low latency but undesirable high midi jitter,
> 5. Finally, the elusive edit box for entering midi latency offset for this 
> device,
> 6. okay,
> 7. cancel.
>
> Sorry I located the wrong set of edit boxes for your particular latency 
> problem, Jim.
>
> The info in my previous message on entering negative or positive offset 
> values still applies, but to this edit box.
>
> Confusing as hell, yes?
> By the way, there's a third offset edit box in Midi, just to add more 
> confusion.
> Indigo
>
>
>
>
>
> On 8/20/2011 11:23 PM, Jim Snowbarger wrote:
>> 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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>>
>>
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