In 1964, shortly before Compton ceased production of pipe organs, the company introduce the 'Augmentum' model.

This was an instrument designed for churches with a small budget whereby the organ would come in 2 parts. Firstly, the pedal and great divisions and a prepared for swell division that could be added later when funds permitted. A standard design of console was used - the same as that used on the model 357 and 363 electrones models that were in production at this time. Only a handful of 'Augmentum' models were built and most of these were acquired by Rushworth and Dreaper when they took over the pipe division of Compton in 1964.

The specification read:

Open Diapason 16'
Sub Bass 16'
Octave 8'
Bass Flute 8'
Choral Flute 4'
Great to Pedal
Swell to Pedal
Swell Octave to Pedal

Open Diapason 8'
Rohr Flute 8'
Principal 4'
Fifteenth 2'
Clarinet 8'
Swell to Great

Viola 8'
Hohl Flute 8'
Vox Angelica 8'
Gemshorn 4'
Cornet Mixture III
Trumpet 8'
Sub Octave

3 double touch thumb pistons to Great and Pedal
3 double touch thumb pistons to Swell and Pedal