Sorry for delay, still waking up here in Chicago...

You just need to R-Click on any of the Mixer-Plugins=Default Synth shown in picture. L-Click opens a menu and R-Click opens the Synth

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BIAB – 2025, Reaper (current), i7-12700F Processor, 32GB DDR4-3200MHz RAM, Motu Audio Express 6x6 - My SoundCloud (Tip: No need to create a SC account to hear music - just hit ESC ).