You need to tell Gold Note that as they seem to use the same design on all their phono stages and get decent reviews off the back of it. Are you also suggesting the signal path is digitised?
I think my post (16) is pretty clear. But since we are here. To do what Gold Note are suggesting in their design, there are basically 3 ways they can implement this in their phono stage. To offer 72 different EQ's would require a significant number of switches to switch in and out the different resistors and capacitors needed to provide all the EQs, and these will need to be in the signal path, no getting around that. In the analogue domain as they are quoting this can only be achieved 2 ways, using relays or solid state switches:
1. Using relays for the switching would require a large number of relays all of which will have their contacts in the signal path. The main disadvantage is the large number of relays required which are large in physical size plus the number of contacts needed, plus their contact resistance, all be it lower than using solid state switches, plus all the tracks on the PCB required would make the signal path very complex and this would impact on the audio performance. To do this commercially would require the relays to be soldered directly to the circuit board. Relays are not massively reliable unless you use the expensive telecoms versions, which are expensive. The only other option is to use DIL sockets so the relays can be plugged in/out so servicing can be much easier. When relays have to be used this is the option I adopt.
2. Using solid state switches. This means that each switch which is basically a transistor will be in the signal path. The advantage of this method is that each switch is small and can be switched by a microprocessor. The massive downside is that you now have a large number of solid state junctions in the signal path and these will be of a much higher resistance than using relays. However there will still be a complex amount of tracks on the PCB which the signal will have to travel through for this implementation.
There is a third way using digital to A to D the analogue signal, then perform the EQ in the digital domain, then D to A the signal to the output electronics. I am ruling this one out as Gold Note indicate they do not use this approach.
As I said in my previous post, to have any noisy microprocessor plus a noisy screen spraying RF noise inside a phono stage is a complete No No in my book, as the last thing you should do is to introduce any noisy digital electronics into a small case which includes a very sensitive circuit like a phono stage which has to deal with such small voltages as low as 0.1mV. Personally unless you have a large number of mono records which indicate what EQ was used I really don't see the point of offering different EQ's for stereo records. See Nagraboy's
post 18 with reference to Michael Fremer's Analogue Planet EQ article.