Retro Tapes results nobody can promise
Spins on the reels land cassettes at random, and nothing on the grid signals when the bonus round will start. How often it comes is not known in advance. The result of one session is random too, whatever the RTP version a player sees.
Every spin on the reels runs under one RTP version, and that version sets the long-run return. Which version this site runs is shown only in the game rules, so read that section before the first spin.
A cluster of matching cassettes on the reels can stack toward the win cap of x10,000 the current bet. That ceiling is reached very rarely, and no session can be planned around it. Hitting it depends on chance alone, and no single spin reveals how close a session is to it.