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Stan_T
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MIDI-OX Rules!
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Realtime Delay
« on: Mar 11th, 2008, 9:05am » |
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I want to use an old MIDI keyboard to "play" my sound card on my computer. I'm running Vista on a newer Gateway computer. I purchased an M-Audio USB to MIDI interface and connected my Casio MT-240 to the computer. When I run MIDI-OX, if I make the USB-MIDI the input, and my sound card (RealTek, integrated in the motherboard) the output, I can play the sound card patches from the Casio. However, there is a delay between the time I press a key on the keyboard and the sound that comes out of the speakers. This delay is just enough to make realtime playing impossible. Is there any way I can eliminate the delay so that the tone is generated instantly when a press a key?
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Peter L Jones
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Re: Realtime Delay
« Reply #1 on: Mar 11th, 2008, 1:59pm » |
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This is nothing to do with either MIDI-OX or MIDI in general.
It's to do with the size of the audio buffers on your soundcard. You'll be getting a similar delay between pressing "Play" and hearing a sound file start playing back.
I have a buffer size of 128 samples on my soundcard. At 44100 samples per second, that's about 0.0029s delay. The speed of sound in air is 1126.547 ft/s at 20C. So that's the equivalent of being about 3-3.5' from the source.
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| « Last Edit: Mar 11th, 2008, 2:07pm by Peter L Jones » |
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"...Playing fast around the drums is one thing. But to play with people for others, to listen to, that's something else. That's a whole other world." -- Tony Williams
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Stan_T
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Re: Realtime Delay
« Reply #2 on: Mar 11th, 2008, 10:32pm » |
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What can I do to increase the size of the buffer?
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Breath
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Re: Realtime Delay
« Reply #3 on: Mar 12th, 2008, 6:26am » |
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I assume you are using the Microsoft(MS) GS Wavetable Software Synthesizer as I don't think the Realtek has a hardware synth on it.
The mixer is usually marked "SW Synth" if it is then you can rule out a hadware synth.
Software synths take a bit of time to get through the MS layers of code.
Try this web page it may help.
http://www.1manband.nl/microsoftsynth.htm
it uses Direct X to bypass the layers of Microsoft code.
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Peter L Jones
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Re: Realtime Delay
« Reply #4 on: Mar 12th, 2008, 1:55pm » |
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on Mar 11th, 2008, 10:32pm, Stan_T wrote:| What can I do to increase the size of the buffer? |
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Increasing the buffer increases the delay. You want the smallest buffer your PC is capable of.
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"...Playing fast around the drums is one thing. But to play with people for others, to listen to, that's something else. That's a whole other world." -- Tony Williams
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Stan_T
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MIDI-OX Rules!
Posts: 3
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Re: Realtime Delay
« Reply #5 on: Mar 12th, 2008, 3:42pm » |
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Thank you both, Peter and Breath. The DirectMusic Producer and MIDI-Yoke solved the problem.
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