3 pedals respectively, to select the distrtion, one to select the delay, one for the pedals modulation.La volume as it can be switched to select the expression.
The top buttons Attributes are a noise gate, reverb, the choice of the tonality of the guitar, and compression / sustainer.
The distortion pedals reserve possde a button change to double the number of possible distortions.
In short, a fairly large selection.

UTILIZATION

The device is simple to use, all are visible on the pdalier and a simple movement of buttons rglage gives you the sound without trying, is to adjust them according to personal tastes tonalitvolume, gain etc. ....
The mnuel clear image of the device, simple ...

SOUND QUALITY

I myself use the I 50 with a 80 watt marshall and guitars lag and Gordon Smith.
The effects are rather well made and with minimal rglages, I find my account in a few manipulations.
The choice is vast distortions, personal sounds I play pretty heavy so I use these souvebt rglages, the phaser and flanger are also often utiliss, about the delays, I use it in the short type Most of the time.
The effects of type synthsquare etc ... I do not use that little trs.

OVERALL OPINION

Bought 249, I 50 is a simple multi purpose and worth some attention.
A person seeking to use simple stuff and making effects Agralis can trust this machine I believe be of no.
I do not regret it at all and I find what I need is APRS everything I was looking for a simple and efficient