The sound library booth

This original notice has five intentional errors.

The programme of listening sessions are designed for people comparing recorded sound effects. Bookings should be made seperately for each session because the booth cannot accomodate more than six listeners. Group's may, after the introductory briefing, requests headphones with adjustable volume. The control panel must remain on its current settings, and recordings should be returned to the correct folder before the session ends.

Proofread the notice. Identify all five errors, then write each correct form. You are not required to rewrite the notice.