The Boss ME-25 multi-effects pedal provides a collection of additional sounds and features over the previous ME unit at the same price. This Boss guitar pedal includes a completely redesigned operating system which allows the entire product to operate in "EZ-Tone" mode, making the Boss ME-25 simple to use. There are added effects, COSM amp models, and a USB port for direct connection to computers. The ME-25 effects pedal is bundled with Cakewalk Sonar 8 LE and a DVD providing over one hundred audio loops that can be imported into Sonar for jamming or practice. The Boss ME-25's 60 onboard programs are organized into a Sound Library, which enables all the onboard tones to be selected simply by type. This built-in sound library gives you instant access to dozens of classic and modern effects. Simply choose a category, select a variation and play. You can customize your sound with simple twists of the Drive, Tone, and Volume knobs. COSM (Composite Object Sound Modeling) Composite Object Sound Modelingor "COSM" for shortis Boss/Roland's innovative and powerful technology that's used to digitally recreate the sound of classic musical instruments and effects. COSM analyzes the many factors that make up the original soundincluding its electrical and physical characteristicsand creates a digital model that accurately reproduces the original.