There is a line output available. Please see the referenced tech bulletin which is available through the link.
There is a circuit in the tech bulletin which shows a Lectron System block LCD voltage display. It allows you to ‘dial in’ the voltage to equate to a desired frequency. The table of these voltages is also in the tech bulletin.
I hope that Mr. CvS would enjoy the site now. He never said anything about the Lectron.Info version 1 site.
We can honor both Mr. CvS and Mr. Kopperschmidt by acknowledging their leadership in bringing the 50th anniversary blocks to fruition.