Hello Daniel, > What parameters would suit a generic passthrough of a command for all > cases? And if this passthrough is developed, will it be abused in that > developers will only support the passthrough and forsake the class spec? I think this is a problem with all usb devices not only usb audio related. What about a generic API for sending Vendor Requests through EP0? The only other way I know is to add a Hid Interface for accessing vendor specific data. This is much more complicated on FW level and sometimes even not possible because of chip limits. I think the descriptors are already complicated enough for usbaudio devices. Here some examples what i need todo in my devices: - read / write some user Settings (EEprom) - download Firmware updates - control (HW) monitor settings - lock / unlock switches on the device - peak meter read which is not supportet by the AC Class Regards Thomas ****************** WDMAUDIODEV addresses: Post message: mailto:wdmaudiodev@xxxxxxxxxxxxx Subscribe: mailto:wdmaudiodev-request@xxxxxxxxxxxxx?subject=subscribe Unsubscribe: mailto:wdmaudiodev-request@xxxxxxxxxxxxx?subject=unsubscribe Moderator: mailto:wdmaudiodev-moderators@xxxxxxxxxxxxx URL to WDMAUDIODEV page: http://www.wdmaudiodev.de/