Only in 1924 Welte introduced the T98 Welte green reproduction system. A music sliding block with 102 perforations (incl. music band guide) was used - the reproduction system can play 88 notes. This meant that standard 88 note rolls could also be played on the instrument. Welte offered the entire repertoire of music rolls in both formats in parallel. Due to the late introduction and the already difficult market conditions from the mid 1920s onwards, it can be assumed that significantly fewer Welte green systems came onto the market. Even the introduction of further variants (Welte as pedal piano) could not change this.

The Welte green T98 scale has the following assignment (from left to right):

Hole "0": Tape guide left (two superimposed holes)
Hole 1: Bass Sforzando Piano and Return (if perforation is long)
Hole 2: Bass Mezzoforte
Hole 3: Forte Pedal (right pedal)
Hole 4: Bass Crescendo
Hole 5: Bass Sforzando Forte
Hole 6-93 88 Tones from A2 to c4
Hole 94: Treble Sforzando Forte
Hole 95: Treble Crecendo
Hole 96: Piano Pedal (left pedal)
Hole 97: Treble Mezzoforte
Hole 98: Treble Sforzando Piano
Hole "99": Tape Guide right (two holes on top of each other)

Welte used the T98 scale in all designs, i.e. Welte green cabinet, Vorsetzer, upright and grand pianos existed.