So I'd been having issues getting Epic Pinball to run with the Gravis Ultrasound in DOSBox. Epic games was well known for making their games for the Ultrasound which generally means it'll sound best with that music/sound option. The table Enigma in particular likes to freeze when playing with the Ultrasound enabled in DOSBox. Looking at the setup program, I noticed that the game wanted seperate IRQs designated for Music and Sound which most DOSBox SVN's don't seem to have an option for.

Enter DOSBox -X.

While this version still doesn't seem to use 2 separate Ultrasound IRQ's, it does have lots of options to try and get hardware comaptibilty as accurate as possible. It can be overwhelming to look through the .conf file on this beast!

I was pleasantly surpised that after configuring DOSBox -X that not only does it seem to fix the Ultrasound freezing issue, but it also fixed my screen tearing issues as well. Which may be of interest to people suffering still with that issue!

So Without Further Ado, here's my install guide (Including the unique shareware demo table). BTW, this will work with GOG galaxy after being configured too.

1. Download and install Epic Pinball

2. In Your Epic Pinball install folder create copies/backups of the following: "DOSBOX" folder, "dosbox_epin.conf" and "dosbox_epin_single.conf"

3. Download DOSBox -X. https://github.com/joncampbell123/dosbox-x/releases At this time I used 0.83.0 release and the Windows binary file "dosbox-x-windows-20200301-030930-windows.zip"
EDIT: With newer builds should download the option in this: "dosbox-x-vsbuild-win xxxxx" format

4. Open the downloaded DOSBOX -X file. For Windows 10 64-bit I used the files in bin\x64\Release SDL2\. Copy all said files (and the Shaders Folder) in bin\x64\Release SDL2 into the Epic Pinball\DOSBOX Folder.

5.IMPORTANT! in the Epic Pinball\DOSBOX folder delete the original "DOSBox.exe". Now rename "dosbox-x.exe" to "dosbox.exe"

6.In the Epic Pinball\DOSBOX folder copy "dosbox.reference.conf" into the main Epic Pinball Folder. Delete the original "dosbox_epin.conf". Now rename "dosbox.reference.conf" to "dosbox_epin.conf"
EDIT: With newer builds, should use "dosbox-x.reference.full.conf"

7.Now let's edit the "dosbox_epin.conf". Notepad is probably the easiest way with "word wrap" disabled.
In the [sdl] section find "fullscreen" and set to "true" ie. the line should look like this after editing "fullscreen = true"
Now continue with the following edits:
"output" to "openglhq" /or/ "opengl" for the original pixel goodness
[render]
"aspect" to "true"
"scaler" to "none"
"autofit" to "false"
[vsync]
"vsyncmode" to "host"
[gus]
"gus" to "true"
"gus panning table" to "accurate"
"irq hack" to "cs_equ_ds" (make sure it's the "irq hack" under [gus] not [sblaster]!)

8.Find and download the Gravis ultrasound dosbox preinstalled files. Open the zip file and copy the "ultrasnd" folder into your Epic Pinball folder.

9. Create a folder called "DEMO" in the Epic Pinball folder. Download the Epic Pinball shareware demo 1.1 (Not 2.1, only 1.1 and earlier have the unique table!) https://www.classicdosgames.com/game/Epic_Pinball.html and unzip it into the "DEMO" folder

10. Edit the "dosbox_epin_single.conf" and replace the contents with the following. 11. Run the game. Make sure you run the sound settings for both the CD Collection and the Shareware Demo in the menu. For the CD Collection set the sound to the "Gravis Ultrasound". For the Shareware Demo I actually recomend "sound blaster pro" with the selected defaults. If you want to use the ultrsound for the demo, I've found you have to set the IRQ so that it doesn't match the internal setup to get music. But even then the sound effects will overpower the music. so what's the point? Still if you want to try it out, I've found the following settings work.
IRQ 11
DMA 3
Port 240H

12. Enjoy the game!

UPDATE: The newest version of DOSBox X allows use of OpenGL shaders. Which means you can get the pixel perfect shader up and running. (Gives Integer correct Aspect ratio correction like "output=texturepp" in DOSBox staging)

To get it working, download the shader pack from here: https://github.com/tyrells/dosbox-svn-shaders (Code -> Download ZIP). From the ZIP "\dosbox-svn-shaders-master\interpolation" folder, grab "pixel_perfect.glsl" and drop it into the root DOSBox folder (NOT shaders).

Make the following changes in your "dosbox_epin.conf"

Have you also tried Epic Pinball with Dosbox Staging?

https://dosbox-staging.github.io/downloads/devel/

The recent development builds of Dosbox Staging have vastly improved GUS support as well. Make sure you are logged into Github when you download the builds, by the way.

DOSBox Staging is indeed a great build! I did try it before when I originally wrote my earlier post, however, and ran into the same freezing issue in "Enigma" after 5-10 minutes of playing while using GUS.

Just for fun, I just tried it again with DOSBox Staging first the latest stable windows-x64-v0.75.2, and when that failed the current test build windows-x64-v0.76.0-alpha-1010-g1209.

Alas, they both froze after about 10 mintues of gameplay on the Enigma table. So for me, that DOSBox X configuration I posted above seems to work the best (Also smoother gameplay for me too).

I am curious though, whether you can play the Enigma table with GUS enabled using DOSBox Staging for about 15 minutes or so without it freezing?

EDIT. Just tried it with the latest DOSBOX X, and the irq_hack for GUS seems to be missing, and it froze for me again in Enigma. So that is likely, what fixes that particular table. At least in my case. Thankfully the DOSBox X 0.83.0 is still available and works!

EDIT 2. Actually looks like that irq_hack for GUS is still available, just have to look in "dosbox-x.reference.full.conf" not "dosbox-x.reference.conf". Thankfully the new DOSBox X does work for me again without freezing with the irq_hack enabled.