P1 STU piezo probe 1 : positioned 10cm towards the curved side from the treble bridge, between ribs 5 & 6, 84 cm from the rear, 196 cm from the keyboard.57cm from the front curved side.

P2 STUpiezo probe 2:positioned directly over the treble bridge, between ribs 7 & 8, 135 cm from the rear, 165cm from the keyboard, 53cm from the back side, 55cm from the front curved side, 8cm towards to the straight rear side from the treble bridge.

Steinway piano soundboard frequency map of vibrations, for C3, C4, C5:

P1 STE piezo probe 1 : positioned directly over the treble bridge between ribs 5&6, 96cm from the rear, 173cms from the keyboard, 46cm from the straight rear side, 556cm from the curved side.0

P2 STEpiezo probe 2: positioned 21.5cm towards the straight side from the treble bridge,between ribs 7 &8, 131 cm from rear, 136 cm from the keyboard, 42 cm from the straight rear side, 66 cm from the front curved side

Two soundboard probe points ‘A’ & ‘B’ were changed for each frequency. ‘A’ was positioned close to or on the position of where the string is coupled to the bridge. ‘B’ was positioned close to the bridge, though in a position of strong movement in the board.