Pinch+frail pattern on open tuned Irish tenor banjo

Video related to the article at MelBay’s Banjo Sessions webzine: This picking pattern which combines bass played by thumbpick and melody played by index fingerpick uppick and ring fingernailpick downpick (downfrail). Actually the pattern is PINCH-FRAIL-PINCH-FRAIL. The task is to play correct bass notes on two bass strings (alternate root-fifth) and not to miss much of the melody on two treble strings. The basic waltz 3/4 rhythm is obvio