Many SDR radios have relatively long latency in their transmit and receive audio paths. It would be ideal if the transmit to receive and receive to transmit times were a little longer to accommodate SDR latencies.
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VARA already has incorporated delay specifically designs for SDRs.
Just FYI : VarAC has no control over that. Once the modem signals VarAC to Key the PTT, it dosn't provide a method to tell it "wait with the sounds for a little while". Its all managed by the modem.
73s
Irad
What SDR are you having issues with? The Flex 6xxx, Apache and SunSDR's have been tested and working well. last year we did some extensive testing with Irad and Jose to work out TX/RX delays in VARA HF by doing some quantitative with special VARA HF software. Changes were made. I personally run a Flex 6500 and Apache Labs Anan 7000DLE daily with VarAC and have had zero latency issues. There are also several SunSDR users too.