[linux-audio-user] Problems with Novation Speedio

Hi all, I would like to use my Novation Speedio with Jack. The Speedio is a USB audio/MIDI interface - sounds like it's similar to the Edirol UA-25 recently discussed here. The MIDI side works fine, but I'm having problems with the audio. The sound is terrible, both on playback and record. The music plays too slowly, at too low pitch, and with lots of crackles. I've tried just about every combination of settings for Jack, but it hasn't helped. I've tried Rosegarden and XMMS - the sound is just the same. The Speedio hardware works fine with Win***s. I also have a cheap CM8738-based soundcard, and that works just fine with Jack. My system is Gentoo 2.6.13 on a Pentium 4 PC. I've just updated to Jack 0.100.0 (from the 0.99 currently 'approved' by Gentoo), but that didn't help. Kernel support for OSS is turned off. I have these modules loaded: snd_seq_midi; sis900 (for my Ethernet card); realtime; snd_usb_audio; snd_usb_lib; ohci_hcd; snd_cmipci (for my CMI8738 soundcard); snd_opl3_lib; snd_hwdep; snd_mpu401_uart; snd_rawmidi; ltserial, ltmodem (for my Winmodem). I'm guessing it's an issue with the snd-usb-audio driver. Any ideas? Could it be a conflict with aRts? Does anyone have the Speedio working properly on a Linux box? Peter Clarke