In Audiotool, creating a good, eargasmic bass drop can be difficult. But, believe it or not, there are ways. Here is a step-by-step guide.
The Drop[]
Pick a tune, and lay that down. It should vary depending on style (ex. EDM, Brostep, house) and it should be either high or low-pitched. Take drums and lay that down, and consider maybe adding a pad effect to back up the main synth. Now, once you have that done, go back to the buildup and take the main synth you used for the drop and lay that down, with a volume modulator making it so that it starts out very quiet compared to the buildup but gets louder and louder and hits its loudest right before the drop. Now, go back to the drop and add a synth previously used in the song at the beginning of the third sample loop. Keep that there until the fourth loop, then cut off the drop. Remember, in music, the magic number is always 4.