ChanSpy, whisper - noise and sound latency

Hi,

i tried to turn on whisper mode on ChanSpy:
ChanSpy(SIP/1002|bqW)
and everything works fine, but when i try:
ChanSpy(SIP/1002|bqw)

spied-on agent cant talk. Sound latency is something about 3-10 seconds and there is a lot of noise, even if i turn off microphone.
Any idea how to fix it?

Greetings