Anybody has an Everlast MTS 400 ?

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Bought this machine some years ago and finally got back at welding more. This machine drives me, and anybody who used it nuts. None of the settings make any sense. I THINK I figured it out, but would love to see if there is anybody else with this machine.Everlast themselves have no clue about the machine and told me they didn't sell many and just should figure it out by trial and error.Major issue are the amp and volt settings. The manual says the amp display are amps, but they are not. Its PERCENT when idle and switches to amps when working. But percent of what ? The machine is rated at 400 amps using 3 phase and 315 amps (manual also wrong here, says 250) at  single phase.Logic would tell that the percent is based on the amp max per power source, but this seems not to be the case. Only the percent based on 400 amps make sense even on single phase.So if this is true, what does the machine do at 100 % ?? The wire speeds seems to be also the same for single and three phase. So if it can only do 315 at single phase but runs the wire speed for 400 amps, is it just wrong (unusable) after 315 ? I.e. amps stay same but wire speed goes up ?Total nonsense is also the volt button on the wire feeder. Settings there are really not corresponding in ANY way to the voltage displayed at the machine.So again, any experience and insight of this machine is highly appreciated.