I have just downloaded the demo of GNMIDI, and tried it. I immediately 
placed my order to register/purchase this program. I am a professional 
musician who uses midi files. I just converted to a new synthesizer and 
my old midi files sound very weak on the new machine. The problem was 
the volume levels. I have been trying to increase the volume of my 
hundreds of old files, one by one. Since there are many multiple volume 
changes, in each track, this is a time consuming, laborious process. 
Your software, with it's "set midi's to a common volume level" feature 
and batching feature, is going to save me weeks of effort. What a great 
product. I have an internet club for musicians and one of my members, 
told me about GNMIDI. You can bet I will be singing it's praises 
in my club and at it's web site and my web sites.
Thanks

Returning to your original question, although the majority of the files you
find will play well, I would still recommend providing yourself with a good
MIDI utility and by far the best is GNMIDI by Guenter Nagler of Austria.  It
is available from https://www.gnmidi.com for  US or 25 Euros.  This is an
excellent utility which performs many useful test and repair functions and
also enables tracks to be moved and mixed at will.  One of the few things it
doesn't do is to deal with the half pedalling problem and your note has
promoted me to write to Herr Nagler asking if he might consider taking
account of this in the next version.

Comment from GNMIDI author:
Since GNMIDI version 2.40 there are operations available that solve such 
MIDI pedal problems (simplify pedal controllers, quantize controllers).

web page: canalt300.webcindario.com/archivos/software.htm

(translated with Google from Spanish)

GNMIDI

A very simple utility with which to cut ours melodys in few seconds.
Very very practitioner, no longer you have work with complicated programs.

Digital Orchestrator saves in MID type 1. It cannot save in format type 0.
You may wish to check the included link	for midi format conversion utilities:

https://www.gnmidi.com

Today is a joy day for me, finally it is possible for me to integrate text
and chords into my midi files
for display on a PSR 9000 with help of your superb program version 2.33
1000 thanks!!!

> Please excuse what I'm certain is a stupid question. I am new to trying
> to edit MIDI files and I'm running into a problem that I can't find the
> answer to.
>
> I'm using Anvil Studio to make adjustments to MIDI files which I
> download off the net. I have figured out how to truncate the songs, but
> what I would really like to do is be able to fade out of a song rather
> than truncate it with an abrupt stop. In Anvil, it seems as though you
> have to record the MIDI to a wave track and fade the volume down that
> way. Somehow that just doesn't seem right to me.
>
> Isn't there a way to do a sort of "global" fade on all the tracks of a
> MIDI to fade down the volume, while still keeping it a MIDI and not
> converting it to WAV format?

Use GNMIDI. It does fadin' like nothing else. Easy and quick too.

Get it at:

https://www.gnmidi.com

>> With what (possibly free) program is possible to split in two a midi file?

Anything called a "sequencer".    I don't need to know about free
ones, but I'm sure there are suckh and someone will recommend one.

Note that a midi file often contains setup data - sounds allocated to
tracks, volumes etc. - at the start.     If you remove this section
and start half way through the song, you may get unexpected results.

If all you want to do is shorten the file, GNMIDI (https://www.gnmidi.com,
Windows) can do that.  Very flexible for this sort of thing, and
avoids any worry about manually cutting and leaving out vital messages
from earlier in the song.

  It isn't too hard to cut out the end of a song using a sequencer,
but taking out the beginning is trickier.  

Hi, I am running your program on Windows and love it. Do you have a linux version?