In MMD 970307, George Bogatko asked about playing a MIDI file on a
Disklavier.  George, I downloaded the file and tried it.  The pedaling
information you have included in the file caused some problems.  The
details follow.

>I have an MX100B (it supports partial pedaling information).  I played
>the file from a sequencer.  As expected, Yamaha interprets a MIDI pedal
>commands as an "off" or "on" state, failing to recognize intermediate
>values.  Any level of pedal information other than none, results in full
>pedaling.

Bob, I'm afraid that the problem is not a Disklavier problem but a
problem with the Midi file you have.  The half-pedal message is a
different channel (65??) than the regular pedal message.  Half-pedal
messages are transmitted on channel 3.  The problem is that the person
who created the Midi file did not have a device to record half-pedaling
(such as the Disklavier) so all you get is on/off for pedaling
information.  This is a very common problem with Midi files.

It is a more difficult to generate half-pedal messages because you have
to keep sampling the position of the pedal while a piece is being played
as opposed to just generating a 127 when it is on and 0 when it is off.
I don't know of Midi controllers that do this.

I'm looking at your note again. So there were half-pedal messages in the
Midi file? If so, then maybe they weren't on the right channel.  I'll
have to check out George's Midi file to see what it contains.

>It is possible that later Disklaviers are smarter about this stuff.  In
>their own proprietary encoding, partial pedaling is supported on all but
>one of the Disklavier models, I believe.

The low-level MX80s do not support half-pedaling I believe.  I don't
think they use optical sensors.

Regards,

Larry Kellogg