There are hundreds of effects pedals / processors out there for Guitar and Bass players to choose from - single effects pedals, multi-effects pedal boards, and "modeling" effects technology (starting to become very popular). With all this to choose from - I will only cover a few of the most common effects on this webpage. Effects Pedals are covered in the first half of this page, and Multi-Effects pedals are covered in the second half of the page (scroll down). There is also a very informative effects "Guidebook" that you can download at the bottom of this page!
Over 5 seconds of delay time, tap tempo without external footswitch, and reverse mode make the Boss DD-6 Digital Delay Guitar Effects Pedal one of the most versatile and interesting guitar effects you'll ever rely on. First-of-its-kind Warp mode generates radical delay effects instantly. Mode, level, feedback, and delay time controls.
The Boss BF-3 Flanger gives guitarists and bassists an updated version of the classic Boss flanger with the thickest stereo flanging sounds ever. Two new modes (Ultra and Gate/Pan) create flanging with incredible depth- plus slicer-type effects and sounds that seem to swirl around you.
The Boss RV-5 Digital Reverb gives you six high-quality reverb modes on a par with rackmount processors costing many times as much. First-of-its-kind Modulate mode detunes the reverb sound for added spaciousness. Spring reverb emulation offers realistic spring reverb sounds. Gate reverb taken from high-end Roland studio gear. Level, tone, time, and mode controls.
From screaming loud to whisper soft, the Boss DS-1 Distortion Pedal can faithfully reproduce the dynamics of your playing style. Level and distortion controls give you complete command of the amount of signal processing. Tone knob lets you tailor EQ right on the unit. The Boss DS-1 Distortion Pedal is a tough stomp box that can take whatever your boot can dish out.
The classic Boss TR-2 Tremolo Pedal creates real vintage tremolo guitar sounds and variations. Built-in wave knob lets you alter the LFO waveform from triangle to square for a wider range of tremolo variations. Rate knob is a sweepable high-speed LFO control, allowing the Boss TR-2 greater control over tremolo speed.
The Boss PW-10 V-Wah is a first-of-its-kind programmable COSM-based modeling wah. But wait, there's more. The Boss PW-10 gives you instant access to 6 classic and modern wah pedal sounds, as well as all-new Double Resonance, Uni-V, and Voice sounds never found in a wah pedal before. The V-Wah features onboard overdrive/booster effects plus 3 digital memories for storing your favorite sounds. Also features noise-free infrared operation.
Guitar Multi-Effects
Here are some examples of some Guitar Multi-Effects Units
CLICK ON PICTURE FOR DEMO
CLICK ON PICTURE FOR DEMO
CLICK ON PICTURE FOR DEMO
Bass Guitar Multi-Effects
There are many Bass Multi-Effects boards to choose from. Below are the three "counterparts" of the guitar versions shown above. Before purchasing any multi-effects unti, you should go try one out first to make sure its exactly what you want (need, expect, etc). * CLICK ON A PICTURE TO HEAR A DEMO (Demo's may not be available for all of them so instead we included a link so you can view more information).
CLICK ON PICTURE FOR DEMO
CLICK ON PICTURE FOR DEMO
All the Multi-Effects models shown for guitar and bass are the "larger" versions (cost is around $300 each - but there are usually smaller "scaled down" versions of these units for much less - some under $100).
Notes on Buying Effects Pedals vs. Multi-Effects Pedals (what’s the difference?).
Why buy one Chorus pedal for $100 when you can buy a Multi-Effects pedal (with 20 different effects) for under $300? If money was the only reason - then a Multi-Effects pedal would be the best choice. But it's not as simple as it sounds. Single effects pedals sound so good because there are more features (controls, settings, etc) that give them their unique sound. Although most Multi-Effects pedals can also sound good, and you are getting tons of different effects, you may not be able to get the same sounds that come from single effects pedals (the settings on multi-effects pedals may not allow you to produce the same sounds as single effects pedals). Amplifier manufacturers are including effects right on the amplifiers now (instead of the standard "Reverb" they are also adding effects to increase the value of the amp). Be cautious about purchasing amplifiers that have effects built in - they may sound great, or they may sound really "cheezy" (it just depends on the manufacturer). Modeling amplifiers will include effects as well - these effects can actually sound pretty incredible... The choices are pretty much "unlimited" so the best advice I can give you would be to experiment - go to your local music store and test out some effects pedals and multi-effects pedal boards (do some comparing of your own). Let your ears make the final decision!
Check out this free Effects Guide Book from Boss. Lots of great information that will assist you with choosing your new effects pedals!
Effects/Multi-Effects 
