You have to buy at least one thing from the supermarket everyday for 10 days.
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If you mean the third Harvest Sprite Channel in Harvest Moon DS or Harvest Moon DS Cute, all you have to do is rescue 20 Harvest Sprites. After your twentieth Sprite you will automatically unlock your twenty-first Sprite who runs Channel 3.
you have to buy the same item from karens supermarket for ten days straight. hope this helped!!
To unlock Channel 2 the Shopping Channel you must buy at least one item from Karen's Supermarket on ten different days. On the tenth day you buy something the Harvest Sprite that runs Channel 2 will be unlocked.
You have to have sprite channel 5 and then he will play all your songs. Copy and paste this site link, and if you don't have the sprite, it will show you how. Plus it shows everything else you need to know about Harvest moon ds cute:http://www.fogu.com/hm6/chan3/sprites/index.php
Some say its autumn 6, try it out