Taubah and Repentance

Q: I used to produce music and instrumentals but alhamdulillah I have repented from both listening to and making music. I am worried about the songs I released before, should I worry about them and try to get them deleted or am I free from it since I repented?

I also produced the background music for a podcast/show. I have sincerely repented from making any more music or sending/promoting my music. I feel absolutely horrible and I hope that this spread of my music doesn't come for me in my grave.

Q: I would like to ask the following question on repentance

1. Does repentance wipe out previous sins?

2. Am I always obliged to confess to the one whom I've wronged even if this might bring severe enmity?

3. How do I feel regret during repenting?

Q: What is the ruling if a person seeks istighfaar sincerely everyday but does not quit the sin?

Q: If we backbite people, will we ever enter paradise if we did not apologize to the people but repented to Allah for the people to forgive us for backbiting?

Q: How does one repent from insulting the Sahaabah? 

Q: If a person makes kufr by calling an average human being the son of god, how should he repent?

Q: If anyone commits adultery or fahashi with someone else's wife, but not sexual intercourse, how does he ask repent to Allah for this sin? Is this huqooq ul ibaad or not?

Q: I made thread bracelets for a school project and my family. Since we’re from the subcontinent, amulets are common.

Some of my cousins asked for bracelets and I made them for their children to wear. I made for others but some of those people have moved out of the country and I am no longer in contact with them.

Also I had wandered into astrology and zodiac signs and stuff, discussing it with those around me including my classmates of which some are kaafirs and some Muslims. I did not know these were acts of shirk and most lasted from before to mid puberty. I don't know what to do so I can give charity on their behalf even if they are kaafirs since I'm not in touch with them.

Before I rarely prayed and fasted but now I know alhamdulillah I’m more practicing and have realized that the shirk I have spread. Is there a way to resolve the issue? I have no idea of their intentions and some are requesting bracelets but what should I say. 

Q: What happens if you make taubah and commit the same sin and this is then repeated 2 or 3 more times?

Q: If a person died and the other person did not get a chance to apologize to the dead person Can he go to the person's grave and ask for an apology? Will the dead person hear him from his grave?