Never fear, unless you have one of the 3(?) custom made mkII monomachine sfx6, your model is essentially a mkI with a +Drive added. The addition of the +Drive is not an upgrade to mkII as has been implied, there are hardware differences such as an AC - AC power adapter in mkI vs AC - DC power adapter in mkII, the SFX6 is unique in that it has a 3 prong adapter with a switchable voltage “The SFX-6 has an IEC 60320 C14 3-prong inlet to connect to a grounded main power supply using either using 115V or 230V (please see “ADDITIONAL REAR CONNECTORS,
SFX-6” on page 8 for further details)”
In desktop versions the deck height (63mm mkII) is also greater on the mkI (77mm). Luckily this information is all available in the user manual and additional differences are detailed on page 114.
here is the information from page 114:
There is also a difference in the signal to noise ratio, and inputs on mkI are unbalanced vs mkII has balanced inputs, so you can check that if you are in doubt:
“The S/N of the outputs on the Monomachine MKII is 100dB. The outputs of the MKII units
are also impedance balanced.
The S/N for a MKI unit outputs is 91dB and the outputs are unbalanced.”
here is an thread with some info about checking balanced vs unbalanced and ways you may achieve that with or without a multimeter.
Trick to identify a balanced or unbalanced connection ? - Gearspace.com
Also if you watch the video I linked, in the first 30 seconds there is a closeup showing that the front panel is that of an SFX60 MKII and not that of an SFX6 on the custom factory made MKII Keyboard.
So now that it is established beyond argument or guessing that a mkII is not just a mkI with the addition of a +Drive, there are some factors here which you can investigate to see if your sfx6 was given the internals of a mkII or if it is a mkI with a +Drive.
As for whether or not the addition was done at the factory as an upgrade to your model at the request of the previous owner, or if it was done with a +Drive that someone had in their drawer, harvested from some other model (as tr909 indicated he is planning to do) that is still an unknown factor, but since we have certain evidence - Ricky Tinez works for Elektron in the US so whoever this keyboard was borrowed from probably knows what they have, he may not always know what he’s talking about but he is showing a legit product one can at least assume.
Hopefully if andreash has time and the resources are still available at elektron HQ he may come up with some other evidence that indicates whether or not a +Drive upgrade service was officially offered as I seemed to think it was, or if this was done as a user upgrade - but either way it is safe to assume that without the user waveforms, digipro, the mkII firmware, the lower signal to noise ratio, the balanced outputs and any other detail of difference - The sfx6 is much more a mkI with a keyboard and a modulation stick than it is a mkII. I wouldn’t upload or change anything without conclusive proof it is compatible with your specific machine and won’t cost you money so unless you are willing to accept that risk and live with whatever consequence the safe thing to do is move slowly, look at the available resources online just as I did to find your information, and proceed only at the rate you are prepared to be set back.
I was going to leave this topic alone but people are giving you bad advice, not sure what else to say.
