Hi LAU, I recently discovered that the output/readable ports of VirMIDI don't send any MIDI messages but the input/writable ports of VirMIDI still work. Here's an example setup: MIDI keyboard -> VirMIDI 2-0 VirMIDI 2-0 -> synth This doesn't work, whereas when starting csound4 listening to the input port VirMIDI 2-0 (with "-M /dev/snd/midiC2D0") and only making the MIDI keyboard -> VirMIDI 2-0 connection everything works fine. I use Debian testing, with alsa version 1.0.8 and here's my modules config for alsa: ,---- | alias char-major-116 snd | alias char-major-14 soundcore | | options snd major=116 cards_limit=5 | | # emu10k1 | alias sound-service-0-0 snd-mixer-oss | alias sound-service-0-1 snd-seq-oss | alias sound-service-0-3 snd-pcm-oss | alias sound-service-0-8 snd-seq-oss | alias sound-service-0-12 snd-pcm-oss | | # terratec aureon | alias sound-service-1-0 snd-mixer-oss | alias sound-service-1-3 snd-pcm-oss | alias sound-service-1-12 snd-pcm-oss | options snd-usb-audio vid=0x0ccd index=1 | | alias /dev/dsp* snd-pcm-oss | | alias snd-card-0 snd-emu10k1 | alias snd-card-1 snd-usb-audio | alias snd-card-2 snd-virmidi | alias snd-card-3 snd-usb-audio | alias snd-card-4 snd-usb-audio | | alias sound-slot-0 snd-card-0 | alias sound-slot-1 snd-card-1 | | post-install snd-emu10k1 modprobe snd-emu10k1-synth `---- Any ideas? regards, Sebastian