The 3233 is a dual model with a sample and hold and a LFO.
This description is from the Series 3000 Modular Synthesizer Instructions Manual.
It also has a different panel PCB. In the above rear photo you can see where I tinned all of the exposed copper.
This reference diagram shows the values of the parts.
The LFO and S&H are two separate functions. The LFO triangle and square output are unipolar 0 to 10 volts. The minimum LFO frequency is 14.5 mHz, or one cycle every ~69 seconds.
The maximum LFO frequency is 9.5 Hz.
The S&H Ext input can be used as a usable internal clock output with light loading. It is a unipolar 0 to -10V ramp. The minimum frequency is 26 mHz or one cycle every 38.4 seconds
The maximum frequency is 16.3 Hz.
This image shows the S&H function using the internal clock.
This image shows the S&H function using the LFO as the clock.