Latency, is not going to cause a slap-back or looping echo/reverb sound. It causes a delay and also it can cause clicks, pops and dropouts, but I've never heard it cause reverb...... Normally, the music tends to be out of sync or delayed from the key press to the sound in the speakers. [/quote]

Not trying to argue, but, depending on what you have connected to your computer and/or soundcard/interface you can accidentally get a slapback echo by hearing the live motoring and the processed sound at the same time. When I get this I usually go to my computers sound properties mixer panel and mute the culprit. Not knowing the experience level of the original poster I thought it might be possible for some to misconstrue echo for reverb. Just covering the basis. But, now that i review the post i see it's very unlikely that would be the case since it seems to all software synth oriented.

Does the noise in your head bother me ?