Alternate tuning and midi devices

Has anyone found that midi devices may not play pitches accurately?
I created an ear training program which has a section for playing
notes in alternate tunings (by importing scala files). If I play
various notes through my computer speakers, and check the pitch with
a Korg chromatic electronic tuner, some of the notes don't read
correctly. Of course it's possible that the tuner is inaccurate. But
I found differences using the same program to play the same notes
through a keyboard.

I don't think any of the equal tempered notes were off. If the tuner
is correct, and the equal tempered notes are correct, that would
point to the "pitch bend" feature of the midi device. Any thoughts?
Thanks.

In a message dated 8/24/04 12:55:53 PM Eastern Daylight Time,
dan@danmozell.com writes:

Has anyone found that midi devices may not play pitches accurately?
I created an ear training program which has a section for playing
notes in alternate tunings (by importing scala files). If I play
various notes through my computer speakers, and check the pitch with
a Korg chromatic electronic tuner, some of the notes don't read
correctly. Of course it's possible that the tuner is inaccurate. But
I found differences using the same program to play the same notes
through a keyboard.

I don't think any of the equal tempered notes were off. If the tuner
is correct, and the equal tempered notes are correct, that would
point to the "pitch bend" feature of the midi device. Any thoughts?
Thanks.

...probably just an error in the implementation but it might be a pitch-bend
range issue which can be corrected. IIRC it's RPN 100 & 101 that adjust
pitch-bend range.

Regards,
Andy F.

Dan Mozell wrote:
>Has anyone found that midi devices may not play pitches accurately?

Yes, that happens. Hope this page helps you solve the problem:
http://homepage.ntlworld.com/robertwalker/test_my_midi_player.htm

Manuel