These D.I. boxes are clutch. The transformers to balance impeadance for low z is tremendously awesome. One was used for stereo keyboard direct input audio capturing.  The other was used primarily on acoustic guitars and if the bass player's amp D.I. was noisy, the GK bass amp combo I have listed has an excellent balanced low z XLR output, not trashy like most amp D.I.s  GK does it right.  Re-focusing...These Radio boxes are the best D.I.s i've ever used.