tvbr is supported,...
it's the quality factor. 
is a command line created by Hybrid,...
-V, --tvbr <n> AAC True VBR mode / quality [0-127]

ffmpeg -y -threads 8 -loglevel fatal -nostdin -i "J:\tmp\2024-04-27@20_59_25_2910\iId_1_aid_1_2024-04-27@20_59_25_2910_01.mp3" -ac 2 -ar 48000 -acodec pcm_s16le -f wav - | qaac --threading --tvbr 127 - -o "J:\tmp\2024-04-27@20_59_25_2910\iId_1_aid_1_2024-04-27@20_59_25_2910_02.aac"
----
Dev versions are in the 'experimental'-folder of my GoogleDrive, which is linked on the download page.
Dev versions are in the 'experimental'-folder of my GoogleDrive, which is linked on the download page.