My boyfriend and I like keeping in contact on yahoo messenger on his android phone, because it's faster and easier than texting, but his phone only makes a really tiny little noise for the yahoo messenger app, and he doesn't hear me when I send him a message. Is there a way to change the noise his yahoo messenger app makes when he receives an IM from me? Or a way to make the notification sound louder? He's got his ringer volume all the way up, and his media volume all the way up, but his yahoo messenger noise is so quiet. He can hear me if I text him from yahoo via SMS, but it's soooo slow to go through. IM directly is so much faster. Thanks.