The sounds are in the rom chips, which are interchangeable with proteus 2k chips. For example, u can put any rom in any box, i.e. proteus 2k chip in an xl7 or xl7 chip in a proteus 2k or xl7 chip in a px-7. Each box will fit 4 chips. So for example I have px-7 which came with Proteus drums rom. I added xl7, beat garden, world expedition chips for a total of 4 chips.
The xl7 rom chip is available for $50 at epr electronics. The mp-7 chip is also available at epr.
The px7 supposedly has higher build quality but that will be disputed here. It also only comes with os 2 on it. Which means u don't have to deal with upgrading OS via MIDI.
Because of these reasons and the rarity of px-7 chip, I believe it is the box to get IF u can find one for a good deal.
I wouldn't pay more than 400 for a command station unless it had rare chips in it and was super clean.
Since you already have a Proteus 2k you can put up to 4 chips in it, and link the two devices with MIDI to be able to control sounds from 8 chips.
Hope this helps.
-matt
> Hi guys,
>
> I'm the happy P2K owner. Recently I bought the Yamaha RM1x for a
> friend of mine, so I had it for two weeks at home and it made me
> thinking about how nice can be a pattern based sequencer. But RM1x was
> not what I *really* wanted, and then I got back to E-mu and their
> Command Stations. I subscribed to this list and I discovered a lot of
> things still happen around this yellow box - I write yellow, because
> I'm really not into the urban stuff, rather Berlin school and ambient.
> So, I'm seriously thinking about buying one and here's my question -
> what can be the estimate price of XL7? I'm perfectly aware that only
> second-hand market can be considered, but still - any estimations
> would be helpful.
>
> Cheers,
>
> Bruno