The Eden WT1205 EQ will pretty easily dial in a your sound without much trouble if you spend some time to get to know the EQ section. It's a simplified EQ compared to the WT series amps which use the three semi-parametric controls besides bass and treble. With the 1205 in EQ channel 1,the Bass EQ control is centered at 30Hz, the Low-mid control is centered at 550Hz, the high-mid is centered at 2.2KHZ and the Treble control is centered at 11KHz. Beware of cutting the low-mids very much. You will dial yourself right out of the mix as you cut those frequencies. Conversely, if you boost them too much your sound will honk at you. So just slowly reduce the boost until that "honk" goes away.
Channel 2 is the Master Channel and you must be plugged into that channel if you want to switch back and forth between the two channels. The difference in the EQ in Channel 2 is that instead of a low-mid and a high-mid control, there is a sweepable mids control that you can set anywhere from 250Hz up to 2.5KHz., whatever you prefer. The Bass and Treble controls are the same as in Channel 1. And yes, you can plug a bass into each of the two channels, set up the EQ and gain separately for each and switch between the two with the footswitch or the button on the face of the amp as desired.
Another thing that will have a HUGE effect on your EQ is the "Enhance Control". Be very careful how you use this. It will boost the bass and the treble while scooping out the Low-mids and slightly boosting the upper mids. A lot of folks on the old Eden forum would run this control up to ~9 o'clock and leave everything else flat. This Enhance control sounds good in moderation, but if you dial this control up much above 9 o'clock, you're going to lose your presence and definition in the mix. Certainly by the time you've reached noon on that control your bass' presence and definition is gone. It works great for low-level playing because we can hear the mids easily at low levels, but we lose the bass and treble pretty quickly. So it's great for low-level playing.
It also sounds good when you are set up for a solo on one of the two channels without having to compete with guitar and keys for your sonic space. If you do solos, it's easy to set one of the channels up for solo and one for normal and switch back and forth between them as needed. There's also a There's a lot of things you can do with that amp because it has two EQ sections that can be run separately and switched back and forth with or even run both channels at once.
A great option on this amp for low-level playing is the Dynamic Boost button at the end of each channel. You can leave your EQ set up for performance as usual but push in the buttons as needed for bass and/or treble at lower levels. With those buttons engaged the EQ will automatically change according the Fletcher-Munson relative loudness curve as you change the level of your sound without the need to twist any other dials.
I personally use a 1982 Jazz Bass with an all-maple neck and 70's era pickup spacing (4" center to center). Presuming there are no room anomalies I need to EQ to compensate for, I just run my EQ flat and boost my low-mids at 250Hz up to 1:30. If I'm recording, my bass sounds amazing with that same low-mid boost but at 550Hz instead of 250Hz. I usually run the rest of the EQ flat and that gets me where I need to be. YMMV so play around with each control until you are familiar how each one is affecting your sound with your bass.
The Adjustable compressor on the WT1205 works well for most uses. It's a one knob control that increases how quickly the compression threshold is reached and how large of a ratio it will use. It will automatically adjust the rest of it as you turn it up or down. I have this same control on my WTDI (DI stompbox with Eden WT preamp built in) and although I don't use it much, IMHO it's far better than the auto-compressor on the other WT amps. Try this first to see how it works for you. If you need more than this, I would be looking for a pedal that has threshold, ratio, attack, and release control. It's also nice if it has a selector for soft-knee or hard-knee, which is an overall setting.
I don't often use my compressor because my bass has excellent sustain. That control can easily take you from just adding a little more sustain to what I call a "Farfisa Organ" sound and anywhere in-between. That organ sounds has no attack on the note; smaller dynamic range or none at all (everything sounds at the same level regardless of how hard or softly you pluck the string) and it holds out the note at the same level with no decay as long as you have the note fretted. So it can be used to augment the sound of your bass if you want, or use it as an effect because the original was recorded with a huge amount of compression. Basically the higher you turn it, the more sustain you get and the smaller the dynamics range will become until there is no range.
OK, so that's a lot of info. If you don't already have it, I've attached a pdf copy of the Operation Manual for the WT1205 for your reference. Pay particular attention to the section titled INITIAL SET UP that you'll find on Page 12. That will save you a lot of frustration in getting the amp to produce its best sound with your bass.
