midi2ly doesn't respect the --key

[yota moteuchi]

Before posting on the debug list
I would like to know if some of you experienced this.

When I try to extract a piece from a midi file which is in f major (1 flat) I do

midi2ly --key=-1 "myfile.mid"

the resulting file have indeed a nice \key f \major printed on top but
all the 'bes' are noted as 'ais'
The problem being that a text replacement mess up the relative notation

e ais c => a bes c (with one octave shift)

Yota