Re: Restrict midi2ly to one voice (partly off-topic)

[Stephan Schöll]

Thanks for your reply, Hans.

I can confirm that the source was a single (Cubase) part and all notes
were on the same MIDI channel.

I checked the source data of the MIDI file (in Cubase) again and in
fact: I found a few places where two or more simultaneous notes did not
have the same length which I had overseen in earlier. My fault, sorry ;-)

With several round-trips Cubase-midi2ly-Lilypond/Frescobaldi I was able
to locate all these unfavourable constellations.

What I have learned: As soon as midi2ly meets more than one (overlapping
note with divergent start/end midi2ly interprets it as polyphonic music,
 thus creates additional voices and fills the score up to this
"polyphonic" position with rests in the additional voice/s.

Regards
Stephan

Am 06.01.2021 um 00:54 schrieb Hans Aikema:
> "|midi2ly| converts tracks into Staff
> <https://lilypond.org/doc/v2.18/Documentation/internals/staff> and
> channels into Voice
> <https://lilypond.org/doc/v2.18/Documentation/internals/voice> contexts"
>
> so make your midi-file contain all music on a single channel should
> result in a single voice
>
> apparently, given the results, your midi is currently 4 channels with music
>
> regards,
> Hans
>
>> On 5 Jan 2021, at 12:26, Stephan Schöll <music@gmx.ch> wrote:
>>
>> Hi
>>
>> I have a self-recorded/-created midi file which I have quantized and
>> simplified to death (lengths and durations to 1/16, no overlaps). Let's
>> assume it's the the left hand part of a piano score. Now I want to
>> convert it to a lilypond file using
>>
>> midi2ly.py -d 16 -s 16 -o "<path to file>\MITM_Piano_LH.ly" "<path to
>> file>\MITM_Piano_LH.mid"
>>
>> This works without errors on the command line. But lilypond generates 4
>> voices and distributes the notes all over these voices which is a mess.
>> I optimized the midi file in a way that midi2ly might simply produce one
>> voice.
>>
>> How can I tell midi2ly to create only one voice? I couldn't find any
>> helping hint in the documentation
>> https://lilypond.org/doc/v2.18/Documentation/usage/invoking-midi2ly.en.html.
>>
>> Best Regards
>> Stephan
>>