Hi Uriel…
By this, do you mean you have followed this document?
A few more questions:
- Does the SynthDef play fine in Supercollider?
- What is your SynthDef named in the SCLang file?
- What code do you use to try to play your new synth in Sonic Pi?
Nevertheless, it would still be useful to see the SynthDef source code to make sure it is formatted correctly for Sonic Pi use