[LAU] Roland A500S: snd-usb-audio error -5

[Francesco Ariis]

On Sat, Jan 28, 2017 at 09:45:27AM +0100, Francesco Ariis wrote:
> Hello linux-audio users,
> 
>     I recently acquired a roland a-500s midi keyboard and I have problems
> using it under linux. [...]

I found the solution. Apparently every Roland series 500 keyboard has
an ADVANCED MODE switch. Turning it off solved the problem.

The switch is on the left side of the keyboard, I suspect this 'trick'
holds true for many A-xyz Roland keyboard.

I'll add a few more words to make this pop up on search engines:
my Roland a-500 (a-500s, a-800pro) keyboard was not recognised, but I
solved the problem.