DOS games were made to be used with ISA sound cards. Most PCI sound cards are made to emulate either a Creative SB Pro ISA card or a Creative SB16 ISA card. But the emulation may be imperfect and not work with all games. Ripper is really a DOS game that is supposed to play in Win 95, but really needs a sound card that is set up for DOS sound.
I tried to look up Maestro sound card on Google and there seems to be two different brands - the Terratec Maestro and the Esswood Maestro. Terratec doesn't seem to be a US brand so I'm assuming you have the Esswood type.
If you have the Esswood type and go here http://www.esstech.com/techsupp/faq-identify.shtm
it should tell you what to look for in Device Manager to find the exact model you have. But it appears to me from the driver page http://www.esstech.com/techsupp/drivers.shtm
that the Maestro is a PCI card. It has no DOS drivers and whatever sound you get in a DOS game has to be done by using Windows drivers to emulate a Soundblaster.
For what it's worth, I used to have a PCI Esswood sound card and I couldn't do a thing with it. It just wouldn't work with any DOS game I tried with it. Maybe someone else knows better than I do how to configure the thing. My solution was to get an ISA Creative SB16 card and replace the Esswood card. You can get them cheap on ebay. They are easy to set up if you have the driver CD. If you decide to get one, just be sure to get the ISA SB16 and not the PCI SB16 because they are very different cards.
The Creative AWE 32 and AWE 64 Gold are also good cards for DOS games, but the ISA SB16 is the most compatible of all. The SB Pro is an older model than the SB16 and I don't know if it will work with later DOS games that use high DMA (16-bit DMA)
Sorry if this is long and sorry I don't know what to do to make your card work. As I said, someone else may know better how to get that card to work for you.