via this auction
"These were obtained as part of an estate sale, not much info on them online so pretty rare! They will need attention to repair or service as part of an extended modular set up."If anyone knows more about these, let us know!. You can see vocoder Substitute-b K. DULAY 1980 printed on one board, and Mixer D K.DULAY vocoder on another.
Update via Underhill in the comments: "Found this in an old electronotes article, #EN 107 16 Filter Bank Design (Ian Fritz).
'PC BOARDS, rFC_: Send artwork for low cost PC boards; PC boards available for Jan Hall's
vocoder, 4, 8, or 16 channel, ENS-76 VCF Option 1 - $6 = E3 each, ENS-76 VCO Option 1 -
$6 * E3 each (using two TL074). Also, European electronic music records and progressive
music records, electronic music circuits from English electronic magazines available.
K. Dulay, 5, Llewellyn Rd., Leamington Spa, Warwicks,CV31 2BJ, England (UK)'
So some chap named Jan Hall designed a vocoder, and them some other chap, K. Dulay made PCB's for it."
