Chris,
The soft-start retrograde external dongle never worked properly (thanks MM). We have boxes of them but if you use it, you need to lock on the power switch (disable it's use).
You can buy stepped attenuators that fit from Raymond on eBay. He did a special run for us.
You would turn on the amp by plugging in power ot the back of the soft-start dongle. Email Cami and she'll send you one for free + shipping. Officially, we had to walk back on our recommendation for using an original ONE/TWO with a soft-start. However, folks do it.
Seth
