Hi Nelson,

Since it's only become possible to input audio into Band-in-a-Box fairly recently (2015), features like the guitar tuner aren't available. Audio input is only used to record for now, and wasn't available at all in 2014, sorry.

There are likely some software tuners available for Mac as well, but I've always used my Boss Chromatic Tuner pedal so haven't looked for a software equivalent. Someone else may be able to chime in with a recommendation.

Thanks
Kent
PG Music