Here are some comments from GNMIDI user to our product or work:

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Subject: Re: chord recognition help
Newsgroups: alt.music.midiweb
> I ve just got into midi with my yamaha keyboard
> and im looking for a chord recognition program (freeware)

Just goto http://www.gnmidi.com/ and get GNMIDI and send Dr. Nagler his
small fee.  This is what you are looking for without question--the rest
just don't measure--it a is the best bag of tools for midi anywhere at any
price.
Subject: useful
I still use your program, from time to time.
Prooved very handy when you're in MIDI, wav, mp3 composing processes!
Subject: Re: MIDI FILES
Forum: alt.music.midi
>Can any one help me I own a casio WK 1800 keyboard on downloading midi
>files from the net only 1 out of 10 work, the rest comes up with the message "err not smf 0"

Midi files come in 3 formats - Type 0 and Type 1 being the most common.
Type 0 files (which it seems your keyboard prefers) have one track containing
data for one or several midi channels to which different instrument patches may be assigned.
Type 1 midi files are multi track - generally carrying data for one channel but not always.

it sounds like you need a sequencer (Cakewalk, Power Tracks or GNMIDI utility) to convert your
downloaded files to Type 1.
Subject: Thanks a lot
From: registered user
This program GNMIDI has been something that I only could imagine, but never
think it could exist. I convinced myself to get the licence since the first 
time I tried it. Thanks for the programs you make. It's working ok.
web page: http://www.carolrpt.com/faqs.htm
Subject:  FAQ to piano rolls 

What kind of software do I need to edit these MIDI files?

    You would use Sequencer Software or a utility program like GNMIDI.


Why won’t the keys on my piano play a file I downloaded from the Internet?

    The piano keys play data found on Channel 1 in MIDI files, and maybe
    none of the music on the file is assigned to Channel 1. If music is
    coming thru the speakers, a simple program change will fix this. Use
    Sequencer software to edit the file, or when using GNMIDI select
    "prepare sound program for PianoDisc" from the Modify menu even if
    you have a QRS or Disklavier system. A good setting on the
    Disklavier for playing MIDI format 0 files is to set L=01 and R=Prg.
    See Owner’s Manual under Import Files.

About My Piano

Is there a way to make my piano play more quietly?

    Yes. It is possible to lower the volume through software
    manipulation of the MIDI file. See the section Editing MIDI Files in
    the Music Files <http://www.carolrpt.com/musicfiles.htm> section.
    The three utilities that have been most successful are GNMIDI,
    veloset, MidiMod2 and the Giebler software. There are also acoustic
    solutions such as foam baffles installed next to the soundboard. On
    MarkIII Disklaviers, the Silent System can be engaged and the volume
    of the tone generated piano sound can be infinitely adjusted. See
    Volume Control in the Editing MIDI Files section of the Music Files
    <Music%20files.htm> page.


I want to sing a song I have a MIDI file for, but the arrangement is 
too high/low for my voice. Is there a way to change the key?

    You can transpose any MIDI file up or down using a program like
    GNMIDI, or any MIDI sequencing software. You can also use the
    Transpose function on your piano.


more comments ... You find information and a demo to this software at http://www.gnmidi.com.