@lewisalexander2020
Zynthian comes with Pianoteq 6 demo. A user can buy a license from Modartt and apply it and can install a later version. I have 7.3.0 installed.
Zynthian provides ability to run the full version or the LV2 plugin. The former presents four controls on the rotary encoders: volume, dynamic, sostenuto and sustain. The plugin presents all / most controls spread over 20 pages. That is 79 controls. Both offer all default presets.
The graphical user interface can be displayed over X11 forwarding or VNC but it is advised to perform with this disabled to reduce resource load.
@scro
Are you using the full version of Pianoteq as listed towards the top of the engine’s list or the plugin listed below the “LV2 Instrument” heading? Have you updated your version of Pianoteq or using the default installed version? You could enable Engines VNC and look at the GUI to see if there are any clues to why it is failing. You could also run patchage from the Engines VNC view and check audio output is routed to system playback. If you were also able to extract some log files during an incident it may help.
I just tried loading Pianoteq 6 demo (not plugin) on my V3 and it looks rather unhappy. The GUI has what looks like a no entry sign next to the preset name and the keyboard is disabled. That might relate to the current state of that machine though - I develop on it so it may be self-inflicted damage. My V4 seems to load okay.