The Koetsu is very under-rated. I owned many step ups, except the Expressive Technology. I have Cotter P and L. To use with Koetsu, the best sound is obviously with Koetsu step-up, followed by P and L. I just don't find L better than the P. The sound of L was too under-damped for me.
If you find the Koetsu lacking it is because there're some tricks into getting it to work and sound well. Pay particular attention to the grouding, as unlike Cotter, the Koetsu was constructed with wood case, not metal.
If you find the Koetsu lacking it is because there're some tricks into getting it to work and sound well. Pay particular attention to the grouding, as unlike Cotter, the Koetsu was constructed with wood case, not metal.