These modes are ' base band heterodyned' as in the generation is performed at the base band , in this case audio , the ' waveform' is then heterodyned / mixed to the wanted frequency , the opposite of the RX process , where audio is presented to the DSP , after the RX has recovered the 'Audio wave' , Tx power should not alter the side band ratio , as long its its linear ,
Alc could provide a leading edge over shoot and tilt of the TX envelope , that's something, the on/off keying , deployed in
Opera is susceptible too , its necessary to reduce the drive to the onset of ALC to prevent a spike on the leading edge,if the audio keying is used ,
Replacing the CW-Key on the other hand , the signal utilises the TX envelope shaping , the system was developed , using the 20 wpm test signal from the racal ma1723 as the standard 'shape'
Power wise , that's a unfortunate situation , the concept of narrow b/w short burst signal is really counter productive , as can be seen from the levels deployed , multiple access at low s/n is best provided by the appropriate techniques , making use of the SSB b/w channel , requiring a second layer in the coding applied to the 'modem' ie the tone placement routines .