AppAdvice has teamed up with Bamboo Group in order to offer you a chance to win one of nine promo codes for Halloween Ringtones Pro ($0.99) for iPhone and iPod touch.

A fun and easy way to make your iPhone spooky for the upcoming holiday, Halloween Ringtones Pro Halloween-themed ringtone creation app that also does tweet, mail, calendar, and reminder alerts.

For the most flexibility, tones and alerts can consist of songs, recordings via microphone, or one of the included sounds. To cut songs and recordings down to the required 40 seconds or less, Halloween Ringtones Pro features simple clip selection and preview tools. In addition, fade, tempo, and echo can be adjusted in small increments. Reducing the pitch is an especially simple way to make vocals sound deeper and seem scarier.

Once you’ve chosen or created your tones, they need to be saved, transferred, and assigned. Unfortunately, the process can’t be done solely on an iDevice, therefore, tones and alerts must be copied to your iTunes library using Dropbox, email, or File Sharing and then synced back. The Bamboo Group even provides an instructional video.

To have a chance at winning one of three Halloween Ringtones Pro promo codes, just hit that tweet button near the bottom of this page or retweet this post from your favorite Twitter app before Oct. 19 at 11:59 p.m. PDT. We will then search the Twitterverse for all of the retweets and randomly choose our lucky winners. The winners will be notified via Twitter, so please be sure to follow us so we can send you your promo code via a direct message.

Non-Twitter users and those of you who want to increase your odds of winning can leave a relevant comment below before 11:59 p.m. PDT tomorrow to have a chance at winning one of the other six Halloween Ringtones Pro promo codes. If you do make an entry via the comments area, please be sure to also check your junk email boxes so that you won’t miss out if you win.

Feel free to participate in the giveaway via either or both methods. Only one entry per person per method is allowed, totaling up to two entries per person if using both.