Good info. Indeed sometimes the receiver just looks for the STOP signal to be transmitted for >= 5 sec, other times the transmitter changes from STOP signal to a PRESET signal. Obviously we would prefer the dedicated PRESET signal, but we don’t get to decide 
.
One way to do this is to already be holding down the button before asking Bond to start recording. That way you definitely catch only the second signal.
The Bond Bridge is designed to capture the end of the transmission, so theoretically you would get the last 0.6 sec of the transmission and would not need to start holding the button down before starting recording. However, in reality there can be gaps in the transmission which may cause Bond Bridge to end the capture early and possibly record only the STOP signal but not the PRESET signal.
If however we are wrong about the STOP → PRESET signal transition, and it is only based on duration of STOP signal, then you’d need to use a higher reps of the STOP signal to emulate 5+ sec button press. This may not work because of a gap in the 0.6 sec buffer, which unfortunately would need to be manually removed by deleting (most of) the 000s at the end of the buffer. Not ideal, but that’s the best I can offer right now.