MM multiple master

I have been attempting to test out Fontforge's MM feature. I have tried various things.

Here I have created a 3-axis Adobe-style MM font, with 8 masters, using only an uppercase E. I can't get Fontforge to make an interpolation (instance) with these no matter how hard I try.
This is the font file:

I have Googled various things relating to this, and looked through all the documentation, and still got nothing. What am I doing wrong?

Hello all.

I have a single semibold display font which I am looking to make a regular and light weight from. I am trying to do this by bringing the font into fontlab and make the other weights form the existing font using a multiple masters approach. Is this possible with just a single weight or will i need to make a light weight or hairline to provide a second master? Thanks in advance for any help.

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