I'm running my RAP-10 under Win95 just fine, and my driver is one
that originally shipped with the RAP-10 when it was first released. 
You shouldn't be having any troubles either.

Here's how to install the RAP-10 driver in WIN 95:

1). Open the Control Panel (folder)

2). Select the "Add new hardware" icon

3). Click "Next"

4). Click "No" to answer "Do you want Windows to search for your new hardware",
    then click "Next"

5). Click on "Sound, video, and game controllers", and then click "Next"

6). Click "Have disk" button

7). Put your RAP-10 floppy with the driver in A: and OK that selection.

8). Win95 should find a file called "oemsetup.inf". Select OK to let Win95
    install the driver.

9). Enter the Interrupt #, Port, and DMA channel. (I had to use DMA
    channels 6 and 7 to avoid a conflict with my SCSI controller which
    uses 5).

Now you need to tell Win95 that you want it (and all other apps that use
Windows MCI API) to use the RAP-10 for digital audio (ie, typically used
for voice and sound effects) as well as MIDI (ie, typically used for
musical scores).

1). Open Control Panel (folder)

2). Select the MultiMedia icon. It will open on the Audio page.

3). You should see the "Roland Audio Producer" in the drop down
    menus for both "Playback" and "Recording". Select it for both.
    You may also want to select "CD quality" for recording, and
    in "Customize", make sure you have "PCM" and "44,100 Hz, 16-bit,
    Stereo".

4). Go to the MIDI page.

5). Make sure that "Single Instrument" is selected, and choose
    the "Roland Audio Producer". (ie, it should appear in the box
    immediately below Single Instrument, as well as in the list).
    (Alternately, since you have more than one audio card, you may
    want to do some sort of custom setup, to divide your MIDI
    channels between your cards built-in modules).

Now, Win95 is setup to use the RAP-10 for digital audio and MIDI.
If you go over to the Advanced page, you'll see something that
looks a little like Device Manager, but it's just for the MultiMedia
devices. Click on the plus sign next to the speaker icon, and you'll
see "Audio for RAP-10", indicating that indeed Win95 knows that you
have a digital audio capable device in the RAP-10. Click the plus
sign next to MIDI Devices and you'll see that Win95 knows that you
have a MIDI capable device in the RAP-10 as well. Click on "Line
Input Devices" and you'll see that Win95 recognizes that the RAP-10
has a Line (Aux) In jack. Unfortunately, there's no mixer driver for
the RAP-10, so Win95 doesn't recognize any way of controlling volumes
for RAP-10 digital audio, MIDI, and Line In. So, none of the Win95
"volume controls" and "mixer panels" will operate with the RAP-10.
But, you can play a MIDI file with the Media Player, or play a WAVE
file with the Sound Recorder. You can also use other software that
uses Windows' MCI API (ie, CakeWalk, Sound Forge, etc).

And don't worry about the RAP-10 not showing up in the Device Manager. 
That's just cosmetic. A Device Manager listing won't affect Win95's use 
of the RAP-10 driver.

For other useful info about the RAP-10, check out my article,
"Roland Audio Card FAQ" on my WWW site.

Jeff Glatt
http://www.surftech.com/public/jglatt