This event is logged when a mid-synthesis voice switch occurs, where the event tokens report the new voice. See NVOCsyst—synthesis start for the list of tokens.
This example shows a log from beginning to end of synthesis, including a change of voice from Samantha to Tom:
TIME=20111214093559567|CHAN=cmdline:user1|EVNT=NVOCsyst|LANG=American English|VOIC=Samantha|VMDL=full_encryptf8|FREQ=8000|PVER=5.2.3|LVER=5.2.3.11292|VVER=5.2.3.11292|APNM=|UCPU=0|SCPU=0
TIME=20111214093559598|CHAN=cmdline:user1|EVNT=NVOCaudf|SAMP=4096|FREQ=8|UCPU=0|SCPU=0
TIME=20111214093559598|CHAN=cmdline:user1|EVNT=NVOCaudn|SAMP=4096|FREQ=8|UCPU=0|SCPU=0
TIME=20111214093559598|CHAN=cmdline:user1|EVNT=NVOCaudn|SAMP=4096|FREQ=8|UCPU=0|SCPU=0
TIME=20111214093559598|CHAN=cmdline:user1|EVNT=NVOCaudn|SAMP=924|FREQ=8|UCPU=0|SCPU=0
TIME=20111214093559645|CHAN=cmdline:user1|EVNT=NVOCsysw|LANG=American English|VOIC=Tom|VMDL=full_encryptf8|FREQ=8000|PVER=5.2.3|LVER=5.2.3.11292|VVER=5.2.3.10334|APNM=|UCPU=31|SCPU=15
TIME=20111214093559645|CHAN=cmdline:user1|EVNT=NVOCaudn|SAMP=4096|FREQ=8|UCPU=31|SCPU=15
TIME=20111214093559645|CHAN=cmdline:user1|EVNT=NVOCaudn|SAMP=4096|FREQ=8|UCPU=31|SCPU=15
TIME=20111214093559645|CHAN=cmdline:user1|EVNT=NVOCaudn|SAMP=4096|FREQ=8|UCPU=31|SCPU=15
TIME=20111214093559645|CHAN=cmdline:user1|EVNT=NVOCaudn|SAMP=594|FREQ=8|UCPU=31|SCPU=15
TIME=20111214093559676|CHAN=cmdline:user1|EVNT=NVOCinpt|MIME=text/plain;charset=iso-8859-1|TXID=NUAN-20111214093559676-cmdline:user1-txt|TXSZ=148|UCPU=62|SCPU=15
TIME=20111214093559676|CHAN=cmdline:user1|EVNT=NVOCsynd|INPT=74|DURS=1610|RSTT=ok|UCPU=62|SCPU=15
