I also have the mini-expander from Bruce with joystick adaptor, so also in that case I will have no problems. PS I have noticed on the emulators Aqualite and Virtual Aquarius that there is a sound problem (background noise).
Aquarius extended basic has the LOCATE and CLS command. https://archive.org/stream/aquariusextendedbasicinstructions/AquariusExtendedBasicManual_djvu.txt
On an actual Aquarius you will need the Extended basic cartridge or the Aquaricart which also provides you with extended basic. On an emulator you can load the extended basic rom first to get acces to these additional commands.
In The Netherlands we got an English manual and some seem to have an extra Dutch short manual included in the packaging. https://www.handleidi.ng/mattel/aquarius/handleiding
It wasn't included when I bought mine which was still a Mattel branded one. Maybe it was only issued after Mattel gave the rights back to Radofin?
Sure, or make a rom file. Maybe you also find this item useful, made by someone in the Mattel Aquarius FB group
https://www.ebay.co.uk/itm/154442047508
I particularly meant the "timing" fine line trick at the left bottom.
He is working on something like this which involves a very good understanding of the timing issues http://48k.ca/breakthrough.html