Nope. Just saying that it removes the mpx if you record from FM.
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Are u familiar with AMTS? MO is that these 2 features make the 707 quite unique(there is a 505 where the only diff is the counter mechanism). The manual also says that the MPX filter kicks in when using Dolby B or C NR. What does the MPX do?
I have used this deck for the Roscoe Remasters. If u are a Beatlemaniac pls check out that topic under Beatle Music at thebeatleforum.proboard.com r
In short it is servo on the bias as they explained. Tape bias is non audible high frequency recorded with music that reduces distortions of the tape. Bias also reduces upper bandwidth so usually some compromise is taken. Because high frequencies in music also work as bias, controlling total amount of them at given moment will keep distortions low while extending bandwidth. System that adjusts amount of bias to keep constant bias+musicHF is called servo and it is the best thing since sliced bread (I had Aiwa deck).