Touchscreen SIP upgrade for ISDN audio mixer - YouTube
Glensound GS-TBMM001 6 x 6 Talkback Matrix Mixer - Intercom / Talk Back - BroadcastStoreEurope.com
GLENSOUND MX6/2/148 ex BBC --1970s | Reverb Belgium
Glensound on X: "ISDN mixer, or cake? Join us for cake and ale to celebrate 50 years of Glensound. IBC Stand 8.E72, Sat 5.00pm. https://t.co/qnRWoBI7Sn" / X
File:Glensound Electronics radio sound mixer (31591421967).jpg - Wikimedia Commons
Glensound BBC vintage Console. Worth it??? - Gearspace
Glensound GSGC25 3 channel ISDN mixer with codec with G722 G711 | eBay