[Techtalk] MIdi, QjackCtl etc.

Miriam English mim at miriam-english.org
Tue Sep 8 15:00:30 UTC 2015


Hi David,

Have you tried adding a synthesiser in the chain?

The keyboard is commonly used to send MIDI signals to control something. 
Jack simply connects things together. Try using Jack to link the 
keyboard to a synthesiser program like Qsynth or FluidSynth. Make sure 
there are jack graphical connections between the keyboard and the 
synthesiser. Jack has 3 different kinds of connections (at least on my 
version): Audio, MIDI, and ALSA. It is a bit confusing because the MIDI 
inputs and outputs can be in jack's ALSA panel or the MIDI panel. It can 
be a bit frustrating at first to get the hang of the logic, but when you 
do, it will kinda seem obvious in retrospect.

The synth should let you select different voices (piano, harpsichord, 
violin, trumpet, etc). It may take a little while to find your way 
around the synth program -- music programmers seem to be a different 
breed from other programmers.

Let us know how you go.

Cheers,

	- Miriam


On 09/09/15 00:00, David Sumbler wrote:
> On Sat, 2015-09-05 at 10:14 -0700, Terry wrote:
>> On 05/09/2015 09:12, David Sumbler wrote:
>>
>> <snipped>
>>
>>> Cannot lock
>>> down 82246176 byte memory area (Cannot allocate memory)
>>
>> <snipped>
>>
>> According to
>> http://askubuntu.com/questions/166126/unable-to-start-jack-cannot-allocate-memory,
>> the fix is to:
>>
>> 1.  usermod -a -G audio theusername
>>
>> 2.  Logout then login again as group membership is only updated on login.
>
> The error I mentioned was just one of the problems.  The link you gave
> was useful, but having followed its suggestions I still have no sound on
> either computer when using jackd.
>
>
> On Sat, 2015-09-05 at 23:39 +0530, A. Mani wrote:
> On Sat, Sep 5, 2015 at 9:42 PM, David Sumbler <david at aeolia.co.uk>
> wrote:
>>> I wonder if somebody can point me in the right direction for sorting
> out
>>> a midi system.  Search as I might, I can't seem to find any *basic*
>>> information about how to set things up, or how things fit together.
>>
>>
>>
>> Join http://lists.linuxaudio.org/listinfo/linux-audio-dev , related
>> mailing lists and have a look at their site.
>
> The users group and the documentation here will be very useful if and
> when I can get the sound working on my computers.  But unfortunately it
> does not cover difficulties in actually getting sound to work!
>
> Thanks to both of you for your suggestions.
>
> I can play a midi file using Timidity, and sound generally works OK on
> both my computers.  The problem I have is that once I have Qtractor or
> Muse running, with QjackCtl too, although everything appears to be
> working I get no sound.  This is after experimenting endlessly with
> different software connections.  It is the same on both computers,
> although they undoubtedly have very different hardware from each other.
>
> David
>
>
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-- 
If you don't have any failures then you're not trying hard enough.
  - Dr. Charles Elachi, director of NASA's Jet Propulsion Laboratory
-----
Website: http://miriam-english.org
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