[LAU] How to find USB sound card IRQ?

Hi all My laptop has 4 usb holes in it, and i have a USB sound card in one of them. Everything works fine, but i have some xruns I'm tying to prio both jackd and the right IRQ process for my sound card. How can i find out which IRQ my USB sound card use? (its not shown belowe...it's maya44 usb) $ cat /proc/interrupts CPU0 CPU1 0: 664 43 IO-APIC-edge timer 1: 829 830 IO-APIC-edge i8042 8: 3 4 IO-APIC-edge rtc 9: 20503 20220 IO-APIC-fasteoi acpi 12: 9059 8991 IO-APIC-edge i8042 14: 92878 94797 IO-APIC-edge libata 15: 0 0 IO-APIC-edge libata 17: 25 21 IO-APIC-fasteoi ehci_hcd:usb1, uhci_hcd:usb7, sata_sil24 18: 304856 304697 IO-APIC-fasteoi uhci_hcd:usb6, ahci, iwl3945 19: 12 13 IO-APIC-fasteoi uhci_hcd:usb2, i915@pci:0000:00:02.0 20: 3849997 3850202 IO-APIC-fasteoi uhci_hcd:usb3 21: 199028 199069 IO-APIC-fasteoi ehci_hcd:usb4, uhci_hcd:usb5 22: 3411 3391 IO-APIC-fasteoi HDA Intel NMI: 0 0 LOC: 24165408 23635862 ERR: 0 MIS: 0