vbrQuality property
Optional. Specify the variable audio quality of this Vorbis output from -1 (lowest quality, ~45 kbit/s) to 10 (highest quality, ~500 kbit/s). The default value is 4 (~128 kbit/s). Values 5 and 6 are approximately 160 and 192 kbit/s, respectively.
Implementation
final int? vbrQuality;