I don't have a BS3200, but from reading the service manual I think you could use TEST MODE (specifically TM37) to reset to default, which will include A.OPT 1. You will lose stored radio stations and CD settings (but not A.MEM stored music).
To enter TEST MODE:
Wait 20 - 30 sec. after connecting to mains.
By means of keyboard from St.by mode: Press Display 0 2 5 8 with no more than 2 sec. between the individual enterings.
Then enter 3 7 (the Test Mode number)
From the service manual for TM37:
Default settings for sale purpose.
Option: 1
Volume: 32
Balance: 0
Bass: 0
Treble: 0
Loudness: OFF
Radio programs erased.
CD settings erased.
Timer settings erased.
After default settings the display shows DEFAULT TM ERROR.
If error occurs in TM the display will show TM ERROR.
Item-number, serial-number, type-number, master pin-code, running counter and all offset adjustments will not be erased.