This might be a bit late, but I have a Line 6 Spider Jam which is the JM4 installed into a speaker cabinet. Same models and jam functions. The Spider Jam came out first then they released the pedal version so users could use their own amps.
In my opinion, the jam along tracks are very limiting. Not much there for a jazzer. Some blues and very rock heavy. Also a bit of modern tracks in the hip hop, industrial, techno type genres. Severely lacking in jazz. You can create your own tracks and load them up, but that's extra hassle.
The looper - the looper wants to use the library of drum tracks. The installed drum tracks are the same as used in he jam tracks I mentioned above. Lacking for jazz. You can play with the menus to record loops without using the drums, kind of a hassle cause it won't save those settings when you turn the unit off. Repeated requests to Line 6 for firmware updates have fallen on deaf ears. I got the Jam when it first came out and in the five years or so, there's only been 2 software updates. The last one coming in 2009 or so. Line 6 seems to be more interested in pushing new products instead of supporting older products.
Now for the tone. There's hundreds of preloaded tones, but most cater to metal heads or are super heavily processed. Not vintage friendly. Since my Jam is integrated into its own amp, I can't really bypass the amp models. I believe you can do this on the JM4 but I'm sure it will require more unnecessary menu tweaking.
Now with a lot of work, I've been able to come up with some decent tones. Nowhere near as nice as the tone of my jam mates tube amps, but definitely more versatile. I can emulate everything from a Blackface Fender to a Roland JC120 to all the metal and spaceship noise you want with some tweaking.
I'm happy with mine despite my complaints. It fulfilled my need for a portable amp with enough power to play with drums but can maintain its tone at low volumes and filled with all the practice features I required. Now having said that, if I already had a good amp, and just needed a looper, I would go with a dedicated looper peddle like the Boss RC units or the Digitech Jamman. Much easier to set up your loops without redundant menu fidgeting.
__________________ "Uh-one, uh-two, uh-three, uh-four.... oh crap! Let's do that again."
Last edited by Mojojojo : 01-29-2012 at 01:14 PM.
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