Suggest me a groovebox that brings me back to music

Hello,

Once upon a time, I was a musician. I took my classical guitar degree 10 years ago. I studied a little of music composition and experimented with computer music. But today, I don't do music anymore. Every time I try to do music, I spend the time looking for synthesizers, creating setups, and so on, and it ends I never play. So, I'm looking for some device that gives me an out-of-the-box experience with synths, effects, and loops. I would especially like to:

• loop audio input
• play with external or integrated keyboard
• apply effects
• use synth and samples
• programming the sounds and synths

Thanks!