Reaper with a Midi Controller

Hi there, been dabbling with reaper for a while, now I'm starting to get into it a bit more; using my Roland SPD-S to trigger and record pre-production drum parts. I've managed to set up the spd-s as a a midi controller, and have used the 'Learn' function in the VST to assign the pads to the sounds I want, but whenever I play a pad I also get a seemingly random percussion sound, such a cowbell or timbale, and I can't figure out where it's coming from? Is this a default sound that reaper produces when monitoring a MIDI track? Is there some way to turn it off? Has anyone encountered anything like this before?

Hello Powelly and welcome to these forums. You'll find many helpful people here and a lot of useful information. It sounds as though the track is routed out of Reaper to a MIDI synth (Microsoft GS wavetable?) as well as to the VSTi. Click the [I/O] button to check - if there is any MIDI hardware output listed - select "<no output>" from the drop-down list. Does the Roland generate any audio?

thanks Darkstar, that's done the trick. I was following an old guide, which told me I had to output to Wavetable synth for some reason, but it's still working with it turned off and the mysterious percussion has gone. Thanks! Now I just need to do something about the latency, and I'm up and running. I'm using a USB MIDI interface cable, so my poor old CPU is having to do all of the processing work (I'm on a PC, not a Mac, btw) I think I'm going to have to find some way to lighten the load...

Thanks Quest, yes I've heard people get some good results with ASIO4ALL, I still haven't managed to get it working. However, I have managed to improve latency just by tinkering with the buffer setting for the 'WaveOut' device. I'll play with ASIO4ALL a bit more, see if I can get it going. Does anyone know of any common issues that may be afflicting me? I still haven't tried turning it off and on again tho, mind you...