diff --git a/main.py b/main.py
index d5718fc..179ba15 100644
--- a/main.py
+++ b/main.py
@@ -4,25 +4,27 @@ import time
 import datetime
 import asyncio
 import os
+from itertools import cycle
 
-PTT_IS_ON = False
-modulations = {
-    "ssb":"./modulations/ssb.sh",
-    "fmrds":"./modulations/fmrds.sh"    
-}
+PTT_IS_ON:bool = False
+MODULATION:str = None
+FREQUENCY:float = float(430)
+modulations = cycle(["./modulations/ssb.sh", "./modulations/fmrds.sh"])
 
 
 # init GPIO
 pi = pigpio.pi()
 # button pin
 pi.set_mode(10, pigpio.INPUT)
+# modulation change pin(change this)
+pi.set_mode(11)
 
 async def run_command(*args):
     process = await asyncio.create_subprocess_exec(*args, stdout=asyncio.subprocess.PIPE, stderr=asyncio.subprocess.PIPE)
     print("Started: %s, pid=%s" % (args, process.pid), flush=True)
 
 
-async def button_press(gpio:int, level) -> bool:
+async def button_press(gpio:int, level):
     global PTT_IS_ON
     while True:
         if(pi.read(gpio)!=0):
@@ -31,14 +33,28 @@ async def button_press(gpio:int, level) -> bool:
             PTT_IS_ON = False
         await asyncio.sleep(.5)
 
-async def main(mod, freq:float):
+
+async def moduation_change(gpio:int, level):
+    global MODULATION
+    while True:
+        # given that the logic is the same 
+        # if it isn't: TODO: rewrite this func
+        if(pi.read(gpio)!=0):
+            MODULATION = next(modulations) 
+        await asyncio.sleep(.5)
+
+async def frequency(gpio):
+    # TODO write this function after hooking up the encoder
+async def main(freq:float):
     asyncio.create_task(button_press(10, pigpio.EITHER_EDGE))
-    global PTT_IS_ON
-    task_created = False 
+    # TODO change after figuring out the logic
+    asyncio.create_task(modulation_change(11, pigpio.EITHER_EDGE))
+    task_created = False
+    
     print("Ready")
     while True:
         if (PTT_IS_ON and not task_created):
-                asyncio.create_task(run_command(modulations[mod], str(freq)))
+                asyncio.create_task(run_command(MODULATION, str(freq)))
                 task_created = True
         elif (task_created and not PTT_IS_ON):
             await asyncio.sleep(1)
@@ -46,8 +62,9 @@ async def main(mod, freq:float):
             task_created = False
         await asyncio.sleep(.5)
 
+
 if __name__ == "__main__":
     try:
-        asyncio.run(main("fmrds", 430))
+        asyncio.run(main("", 430))
     except KeyboardInterrupt:
         print("\n")