[RWP] Running Hardware Midi Module

[Indigo]

I'll try the experiment and record armed setting you describe later 
today, Jim.
Since you're feeding the audio output of your external hardware module 
back into Reaper and listening to it in Reaper, that doubles the length 
of your signal path.
You have two signal paths, midi from Reaper to your module, and audio 
from your module back into Reaper, each with its own latency.
To reduce latency  for the audio from the module back into reaper, you 
need to deal with those pesky buffer sizes, ms settings, in Reaper's 
audio section, and maybe adjust buffer size in your sound card's control 
panel as well. .
Also, just for fun, try putting a check mark in Use Reported Latency; in 
Midi Devices Latency; since, please believe it, it's totally essential 
to allow Reaper to calculate automatic compensation.
Another experiment, try plugging a pair of headphones into your external 
hardware module and learn if latency is less than when you listen to its 
output in Reaper.
That will eliminate the audio portion of your signal path, and'll show 
if midi or audio latency is the greater problem.

On 8/21/2011 10:26 PM, Jim Snowbarger wrote:
> Here is an interesting, and related experiment.
> Use the configuration described below.
> I assume that, when you unarm the midi track, the drum machine stops
> responding.
>
> But, also make an audio track, and feed the drum machine audio outputs
> back into reaper to be recorded on the audio track.
> Now, Arm both tracks, the midi track, and the audio track, at the same
> time.
>
> Plunk around on the keyboard making the drum machine fire.
>
> Now, play both tracks back together, mixing the drum machine audio
> outputs with reapers audio output.
> If things are not compensated correctly, you will hear two separate drum
> hits, separate slightly in time. Each drum hit you generated will have a
> short echo.
> It sounds kind of like two drums hitting at almost, but not quite, the
> same time. I guess the difference here at about 30 milliseconds. Small,
> but very noticeable.
> It's like playing a drum machine through a chorus.
> I guess quantization is your friend, eh?
>
>
>
> ----- Original Message ----- From: "Indigo" <33indigo at charter.net>
> To: "Reapers Without Peepers" <rwp at reaaccess.com>
> Sent: Sunday, August 21, 2011 2:15 PM
> Subject: [RWP] Running Hardware Midi Module
>
>
>> Hi Jim,
>> I just hooked up a drum machine, with a 6 foot midi cable from the
>> midi out of my sound card to its midi in, and, playing it from my midi
>> keyboard there's no latency I can detect.
>> I also tried it hooked up directly from the midi out of my midi
>> keyboard and I can't tell any difference between direct from the midi
>> keyboard midi out and playing the drum sounds when the midi keyboard's
>> output is going through Reaper, and the drum machine is being fed from
>> Reaper, so, excess latency is not a Reaper bug here.
>> I left the midi output device latency offset settings at zero, since I
>> couldn't detect any latency.Have you put a check in the checkbox of
>> the setting in Midi Devices to use reported latency, which will allow
>> Reaper to do latency compensation.
>> My track settings are not very different from what I'm using to record
>> from soft synths, Send to Parent on, solo off, mute off, phase off,
>> effects active, record armed on, record mode input, record monitor
>> normal, monitor items off, automation mode touch, volume 00db, pan
>> center, midi output my sound card port 00, channel all, num channels 2.
>> Here are the significant settings in the single track's routing dialog:
>> master/parent send checked; midi output to the soundcard port 00; send
>> to channel 10.
>>
>> Either your midi interface or the midi module you're driving must have
>> a bunch of latency that Reaper is not compensating for, so Check use
>> reported latency checkbox in Midi Devices.
>>
>>
>>
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>
>
>
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