Tim Reeves wrote:
> Umm... yeah. The fact that he thinks this answers the question
> gives me *less* confidence that he knows what he's talking about.
> If he wanted it a perfect fourth lower, then \transpose does the
> job. And normally when somebody says "a fourth lower", they mean
> a perfect interval. If he wants it a variable fourth lower, then
> it's not doable without scheme.
>
> - Graham
Yes, a variable fourth, if you want to call it that - you finally
got it.
This is like the not-so-helpful answer "You can't get there from
here."
It just took about 20 messages to get to that conclusion.
Actually, there is a way, but it's just something to muck around
with, and takes a lot longer than scrawling stuff by hand on a
sheet of ms paper.
Mididings, the python-based midi router from http://das.nasophon.de/
mididings/, includes a 'diatonic harmonizer', which allows you to
add or substitute a harmony line at a specified interval from the
notes being played, with respect to the home key.
So you could:
1) download & install mididings
2) save the following as test.py
# start of file
# harmonizer.py - example usage of the diatonic harmonizer
#
from mididings import *
from mididings.extra import Harmonize
# substitute a fifth above each note played -- equivalent to a
fourth below, this only works upwards --, based on the D Major scale
run(
Harmonize('d', 'major', 'fifth')
)
# end of file
3) start Jack
4) run python ./test.py
5) connect a (virtual) midi keyboard to mididings input; connect
mididings output to a recorder or sequencer app capable of saving a
midi file
6) run midi2ly on the resulting file
Merry Christmas!
Ditto.