If you press the volume minus button on the headset, the app the goes into a repeating loop of pause-play-pause-play… - each lasting about 0.5 seconds making it unusable. No buttons on the app are responsive.
The regular volume + and volume - buttons on the phone work perfectly.
The only way to get out is to got to phone settings, application manager - ChinesePod and press “force stop”. Has been repeated several times, including after phone restart, so is probably a software bug.
Using android version 2.0.7 on Samsung S7 with factory supplied 7 earbud headset.