I have recently purchased a dealer demo Ayre K3x pre-amp. It is interesting to note that Ayre uses a very similar Shallco sourced Military-spec stepped attenuator volume control in the K3 and K1 that you would find in the BC3. The audio press and manufacters themselves have stated in both cases that this high quality part is big reason for the overall quality of sound. Although I have not lived with the K3 for very long, I can't say enough about how much I LOVE it. Especially the optional on board phono stage(if you into vinyl). What the phono stage does to some of my old crappy second hand records is make them come alive again. I would liken the before and after difference to the difference between an original CD recording played on a vintage 1983 sony CDP versus a remastered SACD on any player of your choice. Its that good! If you are interested, email me, as I know of a few dealers that still have K3 demos for sale (K3 has been discontinued). I know nothing about the new K5 that replaced the K3 except that is does not have an option for an on board phono stage or the Shallco.
All that being said, if you enjoy the BC3, you can't go wrong with the BC21.1. Or Gilbert may be able to give you a custom fix for the dual controls on the BC3. Ayre uses nylon belts to tie the 4 volume controls on the K1 together. ...Oh wait a minute, "what about adding a remote control for volume" this would step the volume for both channels at the same time.
All that being said, if you enjoy the BC3, you can't go wrong with the BC21.1. Or Gilbert may be able to give you a custom fix for the dual controls on the BC3. Ayre uses nylon belts to tie the 4 volume controls on the K1 together. ...Oh wait a minute, "what about adding a remote control for volume" this would step the volume for both channels at the same time.