[SOLUTION] Blocking Mode WhatsApp Sounds
First of all, I do know that this is a fairly old thread, HOWEVER, it is still the first result on google for "blocking mode whatsapp", so i figure this is where people look. So i hope you will forgive me.
I have found a solution to the very annoying problem which many people seem to suffer from.
I have found a way to include the whatsapp sounds under the android blocking mode.
You will need the LightFlow app, (which i believe is a must have app for the S3 anyways (OP said he uses a s3)).
after you got light flow:
1: In What's app:
- disable notification sounds for incoming messages(not in light flow, in whats app). set it to silent or disable at all
2: The go to light flow and:
- enable sound notifications for whats app
- set what ever notification sound you would like to have for whats app when blocking mode is NOT enabled
- under Sounds-->Volume control method-->tick "Android standard notification volume"
Now it you enable blocking mode, it also blocks what's app sounds and if blocking mode is disabled, everything is normal.
hope that helps....took me quite a while to figure it out.
edit: oh and i do not have any affiliation with the light flow app or their developers!!! i just used it for changing lights and came across the sound feature by chance!!!