IRQ means Interrupt ReQuest, and every hardware device has its own, not just Sound Cards. It's the key reserved for each device to ask for any processor work needed, if I'm not wrong. Within DOSBox this, as any other hardware thingy, is not real but virtual, software-emulated. Windows95-98 had its own SB16 emulation with its own virtual IRQ... Guess this doesn't help.
Okay so I don't have quite an idea about how to fix it. But I could have heard about games' not accepting too high IRQs for sound cards, or I could be saying nonsense. (Any computer has no more than a limited number of IRQs, up to around 15 I think.) So try to reconfigure your card to change the IRQ assigned to it. How could this be done? I dunno. Is it possible at all? I dunno.
