Hi Jose,
 > How is the sound of the Doepfer phasers A-101-3 and A-125 compared to older
 > units like Roland, Mutron and the like The classic Mutron Bi-Phase sound is
 > outstanding, but I just want more cv control over the parameters.
The A-125 sounds like the middle class stomp box phasers for guitarists
 like from electro harmonics or ibanez.
 I don't know the A-101-3 in detail, but as far as I know (I am not 100%
 sure about this!) the Mutron had a kind of compression circuitry, which
 is not included in the A-101-3 and which might be simulated with
 additional modules.
 Florian