Hi Mike
I am not into analog at all,wrong person to talk to.I gave it a thought many times but it will cost me a lot to start buying my favorite music in vinyl,Retro 80's,Classic rock,and especially mine and my wifes beloved ethnic music tunes(Greek 60's-70's)that are not available in vinyl anymore.Regarding the 32x or 64x,well in my opinion the 64x outperforms the 32x.Actually the 64x was designed to go with the MD-1.The 32x was more for the Md-2.I have my MD-1 hooked to an ARC DAC3(tubed D/A)with a digital lens .Very nice indeed,but I always have my eyes open for a deal on a nice condition 64x ,particularly the Reference 64.Price is high though,2500$.See if you can get a used digital lens(500$)amazing upgrade!
I doubt that Krell would update your 32x,but the real answer is only a phone call away.Patrick at Krell service is the man to talk to.
Happy listening
George