diff --git a/skitter/__main__.py b/skitter/__main__.py
index 8800e12..8bb47a1 100644
--- a/skitter/__main__.py
+++ b/skitter/__main__.py
@@ -5,7 +5,25 @@ yap yap yap
 import getopt
 import sys
 
+from typing import Final
+
 from skitter.usage import print_help
+from skitter import rtl
+
+def proc_list(raw: str) -> list:
+    """
+    Quality of life for the user.
+    """
+    ret: list
+    delims: list = [',', '+', '/']
+
+    for ch in delims:
+        if ch in raw:
+            ret = raw.split(ch)
+        else:
+            ret = [raw]
+
+    return ret
 
 def main():
     '''main'''
@@ -17,22 +35,76 @@ def main():
         print_help()
         sys.exit(2)
 
+    BAND_DEFAULT:     Final[list] = [87700000, 92500000, 98300000]
+    OUTDIR_DEFAULT:    Final[str] = "Snoops"
+    SQUELCH_DEFAULT: Final[float] = -29.0
+    RATE_DEFAULT:      Final[int] = 1500
+
+    rate_ms: int
+    squelch_db: float
+    out_dir: str
+    band_hz: list
+
+    bflag: bool = False
+    oflag: bool = False
+    sflag: bool = False
+    rflag: bool = False
+
+    barg: str
+    oarg: str
+    sarg: float
+    rarg: int
+
     for o, a in opts:
         if o in ('-h', '--help'):
             print_help()
             sys.exit()
 
         if o in ('-b', '--band'):
-            print(f"band {a}") # debug
+            bflag = True
+            barg = str(a)
+            #print(f"band {a}") # debug
 
         if o in ('-o', '--out-directory'):
-            print(f"dir {a}") # debug
+            oflag = True
+            oarg = str(a)
+            #print(f"dir {a}") # debug
 
         if o in ('-s', '--squelch'):
-            print(f"squelch {a}") # debug
+            sflag = True
+            sarg = float(a)
+            #print(f"squelch {a}") # debug
 
         if o in ('-r', '--rate'):
-            print(f"rate {a}") # debug
+            #print(f"rate {a}") # debug
+            rflag = True
+            rarg = int(a)
+
+    # end for o, a in opts
+    
+    # Set defaults or user values
+    if bflag is False:
+        band_hz = BAND_DEFAULT
+    else:
+        band_hz = barg.split(',')
+
+    if oflag is False:
+        out_dir = OUTDIR_DEFAULT
+    else:
+        out_dir = oarg
+
+    if sflag is False:
+        squelch_db = SQUELCH_DEFAULT
+    else:
+        squelch_db = sarg
+
+    if rflag is False:
+        rate_ms = RATE_DEFAULT
+    else:
+        rate_ms = rarg
+
+    rtl.lock(band_hz, rate_ms, squelch_db) 
 
 if __name__ == '__main__':
     main()
+
diff --git a/skitter/rtl.py b/skitter/rtl.py
new file mode 100644
index 0000000..5ddec03
--- /dev/null
+++ b/skitter/rtl.py
@@ -0,0 +1,12 @@
+#!/usr/bin/env python3
+"interactions with rtlsdr"
+
+def lock(band_hz: list, rate_ms: int, squelch_db: float):
+    """
+    Locking into a set of frequencies.
+        - band_hz: array of desired frequencies i.e. channels in HERTZ ONLY
+        - rate_ms: time to wait between changing channels if no activity
+        - squelch_db: noise ceiling before a channel is considered active
+    """
+    print(f"Band: {band_hz}\nSquelch: {squelch_db}\nRate: {rate_ms}")
+