I went out tonight by myself and on the first stand, they were responding. The first kill was with the Cotton Duet, it took about a minute and a half before the first dog came in and was taken. I then switched over to Den Doggs. It had only played about two minutes and I spotted a group of eight coyotes coming over the hill and around a pond. I was able to take the second, third, and fourth coyote on that stand all within 15 minutes of the initial dog. The new Den Doggs Open worked amazing and the coyotes responded to it without hesitation! I ended a 4 hour hunt with 12 dogs on the ground. I cannot recommend the FREQ enough! I am coming off many years of running Fox Pro, Lucky Duck, and lastly Icotec prior to switching over to the FREQ. Dogs will come in to many calls and sounds but the numbers have been significantly different since making the switch.