That is as great as the software!

The way you describe the process to emulate the multi-market test of Expert Advisor allows to filter the strategies that pass the test on each of the other desired currencies. For example my strategy on EURUSD needs to pass the test on EURGBP & EURCHF & EURJPY. -->4/4

But how to make it pass on 4 other currencies out of 20 other currencies. For example my strategy on EURUSD needs to pass the test on EURGBP OR EURCHF OR EURJPY OR EURCAD OR EURAUD OR etc. but at least 4 out of 20 other currencies. -->4/20

You can perfectly simulate Multi Market now.
Generate a collection on one market with a particular name. Example"

node .\bin\gen.js --symbol EURUSD --period H1 --output generated-on-EURUSD.json

The Generator will generate new strategies on EURUSD and will save the result on "generated-on-EURUSD.json" collection.

The you can load this collection by using `--input` parameter and validate it under different market

node .\bin\gen.js --symbol GBPUSD --period H1 --input generated-on-EURUSD.json -- output validated-on-GBPUSD.json

Express Generator will load your EURUSD collection, will validate it under the criteria you specify against GBPUSD market and will export it with a new name.

You can repeat the process several time using different markets or different criteria.

Express Generator now provides Generator, Monte Carlo, and Collection functionality.

We will add Optimizer and Normalizer soon.

..

Please do not use both "Full data optimizer" and Normalization. It only makes the reactor slower.
Normalizer is like the Optimizer but moves the params downwards only.
If you have Optimizer first, the Normalizer calculates in the same ranges but will not find any better results.

Is it possible to reproduce reactor in express generator.

Best regards