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Re: [Denemo-devel] hum on the mic input

From: Nils Gey
Subject: Re: [Denemo-devel] hum on the mic input
Date: Fri, 12 Sep 2008 13:51:53 +0200

On Fri, 12 Sep 2008 12:25:27 +0100
Richard Shann <address@hidden> wrote:

> On Fri, 2008-09-12 at 12:01 +0200, Nils Gey wrote:
> > > Another route I would like to explore is direct midi input (the small
> > > keyboard I have Yamaha SHS-10 has a midi out), but the only devices I
> > > see are  midi to usb, and have windows drivers...
> > 
> > I'm not sure what you really mean but I got it as Midi-In for Denemo? I 
> > think thats the same work as midi out ergo ALSA/JACK.
> Yes, that is what I would expect, but I am at the stage before that - I
> have no port on my computer labelled midi-in, so I can't plug this
> Yamaha keyboard in. So I have no live midi input signal to work with.

For testing you could just use a virtual midi keyboard. There are plenty in 
Linux avaible. 
Denemo needs an ALSA or JACK Midi-in port (and off course Midi-out). Anything 
else is done outside of Denemo, especially the routing and connecting.

For real hardware-midi you need a proper soundcard. Which one do you have? The 
"standard" PCI card is the M-Audio Delta Audiophile 2469 which is ok for 
professional audio recording and off course Midi for a low price. There are a 
lot of other pci, usb or firewire devices avaible.

> I have looked on the internet for information on getting physical midi
> signals into a computer running Linux but mostly what I see seems very
> old, saying that soundcards are (were?) midi capable but just lacked a
> little bit of circuitry to actually connect the midi out of equipment to
> them. And I see midi-usb devices for sale, but they only mention
> windows.
> Richard
You seem to be a lot outdated or not experienced with audio-linux. Since I 
don't know what you do outside of Denemo I can only guess. However, the status 
Many PCI, Firewire and USB devices work just fine with Linux (while this is 
exactly the order of what-to-prefer when you need low latency and low cpu 
usage). Off course the most hardware-seller don't mention linux but ALSA can 
handle many PCI and USB devices while FFADO/Freebob is for the Firewire 
devices. There are acutally lots of websites and more discussions in mailing 
lists what to buy so I think this is not the right place for this. I mentioned 
the M-Audio 2469 pci card which is just fine if you just need a "pro" card but 
don't record much audio.

So connecting a midi-instrument (keyboard) to Linux is absolutly no problem. 
Like I said, for developing real-time midi or even note-for-note midi in Denemo 
a virtual keyboard should be enough since it doesn't matter if its real or 
virtual as long its midi.


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