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Re: Playback doesn't work if Jack MIDI is used

From: Andreas Schneider
Subject: Re: Playback doesn't work if Jack MIDI is used
Date: Wed, 27 Oct 2021 21:00:35 +0300
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.14.0

Am 27.10.21 um 12:29 schrieb Richard Shann:
> On Mon, 2021-10-25 at 22:24 +0300, Andreas Schneider wrote:
>> Am 25.10.21 um 12:53 schrieb Richard Shann:
>>> On Sun, 2021-10-24 at 15:18 +0300, Andreas Schneider wrote:
>>>> If MIDI is configured to use Jack, start playback plays back two
>>>> notes
>>> are these actually audible?
>> Yes, they are.
>>>> and then stops. Also, the note at the cursor is changed to the
>>>> note
>>>> of
>>>> the first staff while playing back.
>>> Did you mean the cursor position changes?
>> I mean that the note changes its value, e.g. in my example below the
>> c
>> changes to a g.
> This must be one of the most extraordinary side effects ever reported
> for Denemo! If the score is saved before you start playback does it
> become unsaved (the * appears) when the note changes value? If so,
> under gdb a break placed on the function score_status() i.e.
> gdb> b score_status
> should fire off when the note changes in value and "where" should
> reveal the route by which this happened...
There seems to be a loop in Jack. If I disconnect denemo from
midi_playback_1 in QJackCtl, the playback works normally.


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