Yamaha AP-u70 stopped working as Output device with Leopard upgrade

Hello,
I have upgraded my PowerBook G4 to Leopard. The only problem I see, is that my external sound device, a YAMAHA AP-U70, which worked nicely as a sound output device, is now only recognized as Input device.
When I log the plug in with USB Prober, I see:
1246.486 [1] [0x7dc5800] USB HID Interface #3 of device YAMAHA AP-U70 USB Audio @ 2 (0x1b100000)
1246.487 [3] IOUSBCompositeDriver[0x50cd100]::start USB Generic Composite @ 2
1246.749 [3] AppleUSBOHCI[0x26f4800]:ControlPacketHandler error 0xe000404f occured on endpoint (0). todo = 0x40 (Clearing stall)
1246.749 [2] AppleUSBOHCI[0x26f4800]::ControlPacketHandler, returning status of e000404f
1246.750 [3] IOUSBDeviceUserClientV2[0x2a50400]::DeviceRequestIn (sync < 4k) err:0xe000404f
1246.750 [3] IOUSBDeviceUserClientV2[0x2a50400]::DeviceRequestIn < 4K to Apple Internal Keyboard/Trackpad - returning err e000404f, size: 0
1246.754 [3] AppleUSBOHCI[0x26f4800]:ControlPacketHandler error 0xe00002ed occured on endpoint (0). todo = 0x60 (Clearing stall)
1246.754 [2] AppleUSBOHCI[0x26f4800]::ControlPacketHandler, returning status of e00002ed
1246.754 [3] IOUSBDeviceUserClientV2[0x2a50100]::DeviceRequestIn (sync < 4k) err:0xe00002ed
1246.754 [3] IOUSBDeviceUserClientV2[0x2a50100]::DeviceRequestIn < 4K to IOUSBWirelessControllerDevice - returning err e00002ed, size: 0
1246.756 [3] AppleUSBOHCI[0x26f4800]:ControlPacketHandler error 0xe00002ed occured on endpoint (0). todo = 0x60 (Clearing stall)
1246.756 [2] AppleUSBOHCI[0x26f4800]::ControlPacketHandler, returning status of e00002ed
1246.756 [3] IOUSBDeviceUserClientV2[0x2a50100]::DeviceRequestIn (sync < 4k) err:0xe00002ed
1246.756 [3] IOUSBDeviceUserClientV2[0x2a50100]::DeviceRequestIn < 4K to IOUSBWirelessControllerDevice - returning err e00002ed, size: 0
1246.797 [3] IOUSBDeviceUserClientV2[0x2a50100]::DeviceRequestIn (sync < 4k) err:0xe00002c2
1246.797 [3] IOUSBDeviceUserClientV2[0x2a50100]::DeviceRequestIn < 4K to EHCI Root Hub Simulation - returning err e00002c2, size: 0
Has anybody an Idea, what happens and if this issue can be resolved?
kind regards,
André

Use another audio output device, is the way I see it. I don't think this issue will be addressed, there simply aren't enough of us to warrant any time spent on a fix. I'm going to start looking at other USB D/A converters, and just run their analog output to one of the analog ins on my Yamaha. Or scrap the yamaha altogether for something with a little more headroom and cleaner PA stage -- love my AP-U70 as I may, it was always a bit rough around the edges, and started clipping -- even soft clipping -- way too soon. My biggest concern is how I was under the impression that as long as USB audio worked, my Yamaha would work, since I thought USB audio was a common platform that all devices played nice with. If that's the case, how many more smaller-user-base USB devices are being dropped from the "friendly" list during OS updates? Will I plug an older digital camera in one day to find that it is no longer supported? Or my Harmony remote? What next?

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