Well I don’t know what to tell you because all it does is transmit the signal from a magnetic pickup to a 13 pin output in exactly the same way a normal pickup does, but with all strings into one output. There’s no latency because nothing is being changed at all, there’s no processing on board, no triggering etc. I can only assume your external unit wasn’t right. I’ve been using GK basses for years and if there was even a tiny bit of latency I wouldn’t touch them.