diff --git a/spice/.rvals-theory2.md.swp b/spice/.rvals-theory2.md.swp
new file mode 100644
index 0000000..3e615da
Binary files /dev/null and b/spice/.rvals-theory2.md.swp differ
diff --git a/spice/Draft1.asc b/spice/Draft1.asc
new file mode 100644
index 0000000..ce63877
--- /dev/null
+++ b/spice/Draft1.asc
@@ -0,0 +1,2 @@
+Version 4.1
+SHEET 1 880 680
diff --git a/spice/available-resistors.csv b/spice/available-resistors.csv
new file mode 100644
index 0000000..1af093d
--- /dev/null
+++ b/spice/available-resistors.csv
@@ -0,0 +1,26 @@
+Value (Ohms),Pieces,Tolerance
+1,40,5.00%
+2.2,40,5.00%
+3.3,40,5.00%
+10,40,5.00%
+22,40,5.00%
+47,40,5.00%
+68,40,5.00%
+100,40,5.00%
+120,40,5.00%
+150,40,5.00%
+220,40,5.00%
+330,40,5.00%
+470,40,5.00%
+560,40,5.00%
+680,40,5.00%
+1000,40,5.00%
+2000,40,5.00%
+2200,40,5.00%
+4700,40,5.00%
+5600,40,5.00%
+10000,40,5.00%
+22000,40,5.00%
+47000,40,5.00%
+100000,40,5.00%
+1000000,40,5.00%
diff --git a/rvals-theory1.md b/spice/rvals-theory1.md
similarity index 100%
rename from rvals-theory1.md
rename to spice/rvals-theory1.md
diff --git a/spice/rvals-theory2.md b/spice/rvals-theory2.md
new file mode 100644
index 0000000..54d0434
--- /dev/null
+++ b/spice/rvals-theory2.md
@@ -0,0 +1,48 @@
+# Resistor Values and Combinations
+
+...with reducing resistor count as a priority.
+
+This time not while half-asleep.
+
+## 90Hz-110Hz
+
+### low-pass
+$(120 \parallel 47) + 3.3 = 37.072 \Omega$
+
+### high-pass
+$(68 \parallel 47) + (470 \parallel 2.2) = 28.245 \Omega$
+
+## 290Hz-310Hz
+
+### low-pass
+$22 + 22 + 10 + 1 = 55 \Omega$
+
+### high-pass
+$47 \Omega$ resistors are already available.
+
+## 950Hz-1050Hz
+
+### low-pass
+$((68 \parallel 68) \parallel (68 \ parallel 68)) = 17 \Omega$
+
+### high-pass
+$(10 \parallel 10) + 10 = 15 \Omega$
+
+## 3.2kHz - 3.4kHz
+
+## low-pass
+$47 + 1 + 1 = 49 \Omega$
+
+## high-pass
+$22 + 22 + 1 + 1 = 46 \Omega$
+
+## 9khz - 11khz
+
+## low-pass
+$(10 \parallel 10) + (47 \parallel 3.3) + 10 = 18.083 \Omega$
+
+## high-pass
+$(22 \parallel 22) + 1 + 1 + 1 = 14 \Omega$ (better tolerance)
+
+Alternative: $10 + 1 + 1 + 1 + 1 = 14 \Omega$ (worse tolerance)
+