Ok, let's go with the installation:
1) Download the 6 ZIP files containing the drivers from the URL I gave to you in my previous post. These are named "gus411a.zip" to "gus411f.zip". Unzip all of them into a directory accessable from DOSBox.
2) Launch DOSBox and execute the INSTALL.EXE in that directory. Choose to install the files into C:\ULTRASND (if you want to change it, you must change the DOSBox configuration file too). Choose not to install Windows drivers if prompted, as these are not needed unless you have Windows 3.11 installed. When prompted for the configuration values (base address, IRQ, DMA) choose the same you have at dosbox.conf file. If you didn't change any, these values will be 240, 5 and 3 respectively. In SoundBlaster *emulation* values, enter whatever you want, these will be never used (for example I entered the same as the SoundBlaster values in dosbox.conf). The soundcard tests will give some errors, you must skip them.
3) You will end with a C:\ULTRASND directory with a MIDI subdirectory in it, which contains all the sound patches. There will be an C:\AUTOEXEC.BAT file too which you can safely delete. Also, you can delete the directory you created at step 1 if you don't want to keep the original files. To test the MIDI capabilities, execute MIDIDEMO.BAT at C:\ULTRASND directory. With some luck, you will not find the disturbing noise problem I have.
That's all folks 😉
PD: Although the sound patches installed with 4.11 drivers are very good, there is a patch kit, Pro Patches Lite 1.50 made by Eero Räsänen, which is even better. I recommend you to install them, look at the URL I gave in my previous post. Download and uncompress the files like in the step 1 and follow the Installation instructions at PPATLITE.TXT (warning: in step 2, instead of modifying AUTOEXEC.BAT and rebooting, just type "SET PROPATS=x:\yyyyy" at command line and then do the following steps).