[POC] Account with mixing options

2 users, 1 leave = freeze mixer hears everything

changed milestone to %Itération 20

added media label

assigned to @sblin

changed the description

changed the description

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added SprintTo review label

mentioned in commit 3c85f036

changed the description

mentioned in commit a0c3cd72

added SprintIn progress label and removed SprintTo review label

closed

removed SprintIn progress label