Shifting pitch in a MIDI file?

[Angel de Vicente]

Hi all,

yesterday I was trying to find a way to shift the pitch in a MIDI file 
but couldn't figure out a way to do it, so I'm looking for advice here...

My situation is as follows. I have a MIDI file of a piece (for four 
guitars), and I just want to mute one of the tracks and play along with 
my real guitar (a sort of virtual quartet...). But the problem is that 
the tuning of my computer is wrong (I read somewhere that DELL laptops 
had this problem. I'm not sure, but in any case the standard A at 440Hz 
sounds actually like a C).

I could tune up my guitar, but that is quite inconvenient, specially if 
later I want to play with more instruments, so I was hoping that I could 
find a way to tune up or down the whole MIDI output. The Virtual 
Keyboard has a pitch wheel, which it would be exactly what I'm looking 
for if it could be applied to the whole MIDI output... In Rosegarden I 
didn't find anything... In Qtractor I could load up plugins that seemed 
promising (if I remember correctly I could find four plugins with names 
like pitchshift, but I couldn't make them to work, plus they applied to 
individual tracks, and not to the whole MIDI output).

Any pointers?

Thanks,
Ángel de Vicente
-- 
http://www.iac.es/galeria/angelv/

High Performance Computing Support PostDoc
Instituto de Astrofísica de Canarias
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