Maybe the very beginning is to run in terminal

killall pulseaudio

and then follow the steps given by other people on the list

HTH,
Fred






On Mon, 14 Sep 2015 20:42:24 +0100
David Sumbler <david@aeolia.co.uk> wrote:

> I have hesitated for weeks to post here with such a basic and possibly
> stupid problem, but I am at my wits end with this.
>
> I run Ubuntu 12.04 on a desktop computer and also on a small notebook.
> Sound is fine on both of them, and I can play midi files through
> tiMidity with no problem.
>
> I want to use a midi-capable electric piano as an input device, and I
> reckoned the first thing to do was to get some suitable software and
> make sure I could play a midi file from a midi editor.

>
> If anyone feels they have the patience to try to point me in the right
> direction, I shall be very grateful indeed.
>
> David