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Mark Thread UnreadFlat Reading Mode ❐

a-pro and USB hubs

Author Post Essentials Only Full Version
aj Max Output Level: -69 dBFS Total Posts : 1084 Joined: 2003/12/08 08:21:36 Status: offline 2012/11/12 17:24:16 (permalink) a-pro and USB hubs A subtle gotcha with the A-PRO. It may appear to work fine connected through a hub. Ah yes..... but on my setup, regardless of hub type, the knobs and sliders behave very strangely. Specifically, once you move any of them above about MIDI value 70 or so, they start sending messages continuously. Then if you move them back, they stop. This is on Win 7 x64, not sure if this occurs on 32 bit systems as well. Just thought I'd mention it. You can clearly see it by recording to a track and looking at MIDI events. Damn nuisance because my laptop only has 3 USB ports and the UA25 and A800 are now demanding one each, because they CAN'T be externally powered. Yes, the A800 supports a power pack. No, it won't use USB if you connect one, only the MIDI ports. I have utterly no idea why, only some weird geek at Roland knows why they did that. #1 1 Reply Related Threads
aj Max Output Level: -69 dBFS Total Posts : 1084 Joined: 2003/12/08 08:21:36 Status: offline Re:a-pro and USB hubs 2012/11/19 14:41:51 (permalink) Having acquired a 10 port 'plugable' brand powered hub, I can confirm that the problem does not occur if the A-800 is plugged into the new hub. These hubs were the only ones I could find on Amazon where the majority of the reviews were positive. So far it has worked well; I've just left the UA25 directly connected to the laptop and everything else now plugs into the hub. #2

Author

Post

Essentials Only Full Version

Max Output Level: -69 dBFS

Total Posts : 1084
Joined: 2003/12/08 08:21:36
Status: offline

2012/11/12 17:24:16 (permalink)

a-pro and USB hubs

A subtle gotcha with the A-PRO. It may appear to work fine connected through a hub. Ah yes..... but on my setup, regardless of hub type, the knobs and sliders behave very strangely. Specifically, once you move any of them above about MIDI value 70 or so, they start sending messages continuously. Then if you move them back, they stop. This is on Win 7 x64, not sure if this occurs on 32 bit systems as well. Just thought I'd mention it. You can clearly see it by recording to a track and looking at MIDI events. Damn nuisance because my laptop only has 3 USB ports and the UA25 and A800 are now demanding one each, because they CAN'T be externally powered. Yes, the A800 supports a power pack. No, it won't use USB if you connect one, only the MIDI ports. I have utterly no idea why, only some weird geek at Roland knows why they did that.

1 Reply Related Threads

Max Output Level: -69 dBFS

Total Posts : 1084
Joined: 2003/12/08 08:21:36
Status: offline

Re:a-pro and USB hubs 2012/11/19 14:41:51 (permalink)

Having acquired a 10 port 'plugable' brand powered hub, I can confirm that the problem does not occur if the A-800 is plugged into the new hub. These hubs were the only ones I could find on Amazon where the majority of the reviews were positive. So far it has worked well; I've just left the UA25 directly connected to the laptop and everything else now plugs into the hub.

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