Just to add:
The "Fat Mod”
TriAxis' shipped after June 97 have new “Lead 1 Red” as standard specification. Serial #'s below 5200 have Lead 1 “Recto Mod” (board TX04 added) and above 5200 have "Fat Mod". This mod is a circuit change to mode Lead 1 Red (both software and hardware). A kit is available, that will enable an authorized MESA technician to do the work. Look for one in your area or contact MESA directly. MESA advises that users test a new TriAxis at their local dealer to see if the new tone works for them, before having the modification done. If you're happy with the sound of Lead 1, you may not like the change. I believe this mod is for those users that don't use their Lead 1 mode often. This modification will expand their use of this particular mode.
The current tone is described as being "fat (of course), singing soloing tones that are super smooth", the high-end has been tailored (rolled off) for more balance. It emulates the circuitry in the Rectifier series of amp. Someone says that more closely resemble (somiglia maggiormente) to the Orange Channel of Dual Recto.
The most current software version for TriAxis is 2.0. Serial #'s above 1700 are version 2.0. When you power on TriAxis the panel lights will flash a "1" for Version 1 or "2" for Version 2.
If you’ve TriAxis and are still not sure if yours is with or w/o “Fat Mod” here’s how to find out: restore your factory presets (pg. 5 in the manual), then set your TriAxis on Factory Preset #01:
Lead 1 Red Preset # Gain Tre Mid Bass Lead1 Lead2 Master Pres. D.Voice
w/o 01 6.0 5.0 7.0 7.0 6.0 - 5.0 5.0 0.0 British Shred
w/ Fat Mod 01 6.0 6.5 7.5 8.0 5.5 - 4.5 5.0 0.0 Rectifier
w/ Fat Mod 10 6.0 6.0 7.0 8.0 2.0 - 5.5 2.0 0.0
From Version 1 to Version 2 the differences seem to be:
Treble Mid Bass Lead1 Master
+1.5 +1.0 +1.0 –0.5 -0.5
Difference between models
Version 2.0 allows for Continuous Control changes of all parameters within a preset with the use of a CC pedal (or multiple pedals one assigned for each facet of the channel, ie presence, lead, middle, treble etc). You could for instance get a pedal and assign it to at toe down be a clean sparkly sound then as you roll back the pedal assign it morph into a dirty sound as you the gain and presence etc increase.
Actually there are 4 TriAxis versions:
- v1.0 original ‘British Shred’, w/o CC s.n. <= 1700
- v2.0 ‘Recto Vintage’ (w/o “Fat Mod”), with Lead 1 Red Recto board and CC 1701 <= s.n. <= 5200
- v2.01 ‘Recto Vintage’ with a modified Lead 1 Red (“Fat Mod”), Recto board and CC 5201 <= s.n. <= ???
- v3.0 ‘Classic Boogie Lead’ (LoneStar) w/o Lead 1 Red Recto board, only CC ??? <= s.n. (Oct/2004)
However, looks like the user manual refers to Lead 1 Red as Recto Vintage Lead while the website describes it as Fat Recto.
Version 2.x has different Recording Outputs than Version 1.0 (as stated in TriAxis v1.0 manual, © 1992, Mesa Engineering): Record: These jacks "A/B" are the outputs of the Recording circuit. The jacks are individually voiced for clean rhythm playing and overdriven lead playing. The top jack "A" is correctly voiced for clean playing and allows the full spectrum of frequencies through for the brightest, warmest clean sounds. The lower jack "B" is EQ'd specifically for overdriven high gain sounds and produces the sound and feel of a power amp/speaker combination.