Setting Pitch Bend Range?

I'm guessing..... but those midi files that were not yours likely had midi commands in them to change the pitch bend range in your synth. Setting the range back to what it was, or the default, can be done via the synth's user interface but it's highly dependent on the synth you are using. For my Roland JV-30, midi commands called RPNs (Registered Parameter Numbers) are used to set the pitch bend range (or sensitivity) to be from 0 to 24 semitones. The JV-30 synth on power ON resets the sensitivity to the default of 2 semitones. ProAudio itself does not know or care about the pitch range sensitivity. It just sends the pitch bend data values (which run from -8192 to +8191) which are then mapped over the pitch range in the synth.
--Larry

I've done some experimenting with PA9 and Pitch Wheel Sensitivity and my JV-30 synth.
The JV-30 does not reset the sensitivity on a power ON. I was wrong about that. However, the JV-30 has a bunch of Performances, which are pre-defined setups of intruments and other parameters for all 16 channels. Switching to a Performance sets all the params, including the sensitivity, to the values specified for that Performance. So I can get back to square one by switching to some other performance and then back again.
PA9 has an option to zero all controllers when playing stops. PA9 does not zero out the wheel sensitivity though. A value of zero wouldn't likely be desired anyway.
PA9 has the facility to insert wheel sensitive RPNs into a midi track without having to do it the hard way. With a midi file open, select a track and then open the piano roll view. There should be an upper pane (with piano notes, etc.) and a lower pane showing various things. What is shown is selected by the three drop down lists near the top left of the piano roll view. Often it shows velocity. Anyway, use the first drop down to select RPN, then the second one to select Pitch Bend Sensitivity, and the third one to select a channel. Then you can draw in whatever sensitivity you want.

If you can't see the lower pane, hover the cursor at the bottom edge of the upper pane and the cursor will change so that you can click and drag the divider bar up to reveal the lower pane.

To set the sensitivity to what you want (likely 2 semitones) you need to put in at least one event with an appropriate value. For my synth a value of 127 results in a sensitivity of +1 and a value of 255 gets a sensitivity of +2. When drawing in the lower pane, the value to be entered shows up near the upper left corner of the piano roll window.

Another way to do this is to open the event list and add the event there. After entering an event, double-click the event KIND and select RPN. Then double click DATA and enter 0. If Pitch Bend Sensitivity doesn't show up then click and hold and scroll (down or up) until you see it. Then double click the value to the right of Pitch Bend Sensitivity and enter 127 or 255 or whatever you like.

I can't say I understand the mapping of the event value to the synth's sensitivity but experimentation might tell you something.

After all that, play the midi file and see what you get.

--Larry

I had the same problem for a long time until I found this.
It has worked for me, I hope it helps you, too.

there is a way to change the amount of pitchbend so you can
bend the pitch more (or less) to suit your needs. Here's how:

In measure 1 insert CC100 with value 0, then CC101 value 0, then CC6
value x, where x = number of semitones you want the maximum bend to
be. 12 would be an octave, 7 would be a perfect 5th. What you’re
doing is using two special controllers (100 and 101) to activate
a "category" (in this case pitchbend) and using a data value (CC6) to
set the range in semi-tones. Now it's not easy to bend a note one
step when the maximum range is set to 12. So, wherever you want to
just bend a little bit, insert a CC6 value 2 (2 semi-tones) and the
maximum bend range updates to that value. You can insert a CC6
anywhere in the track. From that point forward the maximum bend range
is the current value. It's a good idea to always return the value to
2 at the end of the track since that’s the standard and the next song
might bend improperly. A General MIDI On message at the start of the
next song will prevent that from happening. See the previous e-LINE
(if you still have it) for more about that.

Using pitchbend control in this way makes it far easier to get
realistic bends because you always know where the wheel
"bottoms out." A perfect example of this is in bass parts. If a bass
note bends in a subtle way from below the intended pitch up to the
real pitch you cannot easily do this unless the maximum bend range is
low (2 semi-tones). But if it is low, there is no way to do a "fall-
off" bend that may bend as much as an entire octave. The solution is
to lower the range wherever more precise control is needed and
increase the range where larger bends are needed.

Another helpful device is inserting single pitchbend events to
suddenly change a note's pitch, kind of like the pitch-correction
effect in that Cher song. A good approach is to set the range to 12.
Then, a bit of simple math gets you the exact pitchbend value to
insert. Here's how:

The maximum pitchbend value is 8191. If the maximum range is 12
(one octave) then each note in the octave is "bent" by 1/12 of 8191,
or 682 (close enough). So if you want to bend C up to D insert a
pitchbend of 1364. This procedure is great for "stair-stepping" notes
between two (or more) pitches. Same goes for bending down, only you
insert negative vales. Inserting a -2046 bends C down to A. It will
only take a minute to make yourself a chart with all the values. It's
just 682 times the number of semi-tones you want to bend to.