| Great | Swell | ||||
|---|---|---|---|---|---|
| 16' | Violone | 8' | Viola Pomposa | Salicional | |
| 8' | Diapason | First Diapason | 8' | Viole Celeste II | Vox Celeste II (TC) |
| 8' | Second Diapason | 8' | Rohr Bourdon | Bourdon (TC) | |
| 8' | Harmonic Flute | Concert Flute | 4' | Octave Geigen | Octave |
| 8' | Viol d'Orchestra | Viol d'Gamba | 4' | Traverseflote | Flute Traverso |
| 8' | Dulciana | String | 2 2/3' | Nasard | Twelfth |
| 4' | Octave | 2' | Piccolo | Flute | |
| 4' | Spitzflote | Flute | 1 3/5' | Tierce | Tierce |
| 2' | Fifteenth | Fourniture IV | |||
| Mixture IV | 16' | Waldhorn | |||
| 8' | Trompete | Harmonic Tuba | 8' | French Trumpet | |
| Chimes | Tubular Chimes | 8' | Hautbois | Oboe | |
| Tremulant | 8' | Vox Humana | |||
| Tremulant | |||||
| Choir | Pedal | ||||
| 16' | Erzahler | Open Flute | 32' | Contre Violone | |
| 8' | Diapason | 16' | Diapason | ||
| 8' | Holzgedeckt | Stopped Flute | 16' | Violone | |
| 8' | Erzahler | Viol d'Orchestra | 16' | Bourdon | Bourdon |
| 8' | Erzahler Celeste | 16' | Lieblichgedackt | ||
| 4' | Prinzipal | Octave | 8' | Octave | Octave |
| 4' | Erzahler Celeste II | 8' | Gedacktflote | Flute | |
| 4' | Koppelflote | Rohr Flute | 4' | Choralbass | Super Octave |
| 2' | Oktav | Fifteenth | 4' | Flote | Flute |
| 1 1/3' | Quintflote | Mixture III | |||
| Zimbel III | 32' | Contre Bombarde | |||
| 8' | Festival Trumpet | 16' | Bombarde | Harmonic Tuba | |
| 8' | Krummhorn | Clarinet | 8' | Trompete | Harmonic Tuba |
| Tremulant | 4' | Clarion | Harmonic Tuba |
The organ was installed in 1933-34, answering to an invitation to bid advertised by Mr. Clifford F. Frey; Sec. School District of the City of Bethlehem. The instrument installed met the requirement in the bid advertisement for a "used instrument in guaranteed condition". The project was a joint effort by the fledgling Fritzsche Organ Co., (formerly the Durner Co.), Organ Supply Co. of Erie, PA and the Civil Works Administration of Northampton County (CWA).
In 1996, the 75th anniversary committee composed of students, staff and alumni of Liberty, formed an Organ Study Committee in 1996. The committee studied the feasibility of the project and recommended the restoration of the pipe organ begin in 1997. With encouragement from the School board, Superintendent and William Burhardt, Liberty's Principal, the project began. Funding was accomplished by donations for the actual restoration and the establishment of an endowment fund to ensure maintenance and continued performances. The Allen Organ Co. and Fritzsche Organ Co. were contracted to do the restoration and was completed in 1999. The organ received a new digital console, restored pipe work and additional digital voices.