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MIDI over qmidinet
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wyleu



Joined: Jun 26, 2004
Posts: 39
Location: Sandbach,Cheshire, UK
G2 patch files: 4

PostPosted: Sat Mar 23, 2013 5:36 am    Post subject: MIDI over qmidinet
Subject description: MIDI errors over wireless network
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I've been experimenting with MIDI over IP.

A laptop tosh running 32bit Ubuntu 12.04.2 LTS precise connected to an Ensoniq EPS via a maplin usb to MIDI converter is communicating over wired 100Base to an EeePC running Ubuntu 12.10 quantal. connected to a JP1010 then Thru to a Nord Modular.
Ran a simple 1 bar sequence from the EPS addressing two channels. Channel 1 JV1010 Piano, Channel 8 Flute voice on Nord. LEft it playing for a couple of hours. No held flute notes and keyboard on EPS plays the JV-1010 with no error ( except that added by keyboard operator Smile )

Sadly wireless not as successful. Stopped notes and hiccups. Sad

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EdisonRex
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PostPosted: Sun Mar 24, 2013 4:37 pm    Post subject: Reply with quote  Mark this post and the followings unread

Wireless is a much less forgiving environment.

Try changing the wireless channel. Reduce interference. Make sure you have a clear 4-bar connection. Reduce interference. Try an ad hoc network just between the few devices without a hub. Shut off your microwave and DECT phones. Shut off your neighbour's ones too.

Wireless can be a bitch, it doesn't do realtime very nicely.

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wyleu



Joined: Jun 26, 2004
Posts: 39
Location: Sandbach,Cheshire, UK
G2 patch files: 4

PostPosted: Mon Mar 25, 2013 12:36 am    Post subject: Reply with quote  Mark this post and the followings unread

Thanks for that.

I've been trying different wireless adapters, and removing sources of interference. When looking at the 100 Base T hub the rapidity of the flashing lights gives a rough idea of how hard it's being worked. Since I was investigating this for stage use I fear the only really acceptable way is a dedicated wired hub,which is a pity as it means more clutter.
The biggest problem is held notes. Given the people playing the instruments are very good musicians but not particularly technically savvy you can't really ask them to not worry and talk about panic buttons.

A plus is the absence of all the MIDI ports and simply allowing all devices to act on their own MIDI channel and just pick them up as they are needed. Anything can play anything rather than lots of plugging or configuring.

I'm looking at sticking it on Raspberry Pi's in the end but I've got to justify the reliability to myself first.

The wireless system hasn't managed to play for more than a minute without stuck notes and drops out for two or three seconds, obviously this will always occur at critical moments. The wired solution got throu' a two and a half hour rehearsal last night with no confused innocents.

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EdisonRex
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PostPosted: Mon Mar 25, 2013 1:19 pm    Post subject: Reply with quote  Mark this post and the followings unread

Most likely the tiny packets are making collisions, or worse, killing the bandwidth of the wireless channel. the 5GHz band is more tolerant, (-N) less interference and 56mb bandwidth. Stuck notes, unfinished bends/continuous controllers, yeah, it's ugly and bad, bad, bad for untechnical performers.

Good luck.

p.s. wires can be managed, even on stage. length shouldn't matter, and you can get dark colours. Use a good hub, not a cheap one - netgear blue metal boxes, not the plastic grey ones, work ok, no cheap chinese hubs.

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