The brown box is a Fuchs Plush Verberator that makes the stock F/X loop tube buffered and adds a further F/X loop. It's probably best if I let Fuchs explain:
Unlike other “tube pedals,” the Tube FX Loop™ features a power supply with a unique regulated switching technology that takes the incoming 9 volts and converts it up to the optimal 300-Volt high voltage a tube really needs to operate best. In addition, a precision 6-volt DC regulator provides consistent DC power for the tube filament assuring lowest noise and consistent performance despite any changes to incoming line voltage. It can also be used as a tube buffer to convert an incoming high impedance signal to a low impedance for long cable runs or driving a pedal board. The recovery (gain) stage can be used to boost the level of a guitar or pedal board with a true tube audio stage. It provides a warm sweet utility gain stage with a multitude of uses. The Tube FX Loop™ features a unity gain cathode follower to work with any amp that has passive preamp output - power amp input patch jacks, and not a true active effects loop like Ceriatone, Dumble, Bludotone, Brown Note, Quinn, and many other amps. It has a send level control and high headroom. The return portion of the loop features a high impedance input (250-K) and a low output impedance (5-K) with its own level control as well. The loop can be run in series or parallel modes, and features a level adjust switch for rack or pedal style effects.
The other pedal is a Sonic Research Turbo Tuner ST-200.