Found this on the Ultimarc site, that the PS2 mode acts differently than the USB interface. "What about key-repeat (Typematic)? In USB mode key repeat is supported as on a normal keyboard and is handled by the PC. In PS/2 mode key repeat is not generally desirable for gaming because sending unnecessary strings of key-presses to the PC can cause unwanted clutter on the PS/2 interface and steal CPU cycles. It is useful though to have key repeat outside of gaming, for example for scrolling up and down game lists in a front end. The I-PAC solves this problem by implementing a selective repeat on up/down only, for scrolling through lists. If you have a need for repeat on all inputs, this can be supplied on request." (http://www.ultimarc.com/ipac5.html) You could try using IPAC Joy1 up/down for flipper left/right to see if behavior is different. Should check to see if VP flipper behavior changes though...